癌细胞和正常细胞的关键区别是什么？
What are the key differences between cancer cells and normal cells?
癌变往往源于原癌基因或抑癌基因（如p53）的累积突变。癌细胞失去接触抑制，能无限增殖、逃避凋亡，还诱导新生血管供给养分，并可脱离原发部位转移。免疫系统能清除一部分异常细胞，这就是"免疫监视"的概念。
Cancer usually arises from accumulated mutations in oncogenes or tumor suppressors such as p53. Cancer cells lose contact inhibition, proliferate indefinitely, evade apoptosis, recruit new blood vessels for nutrients, and can spread to distant sites. The immune system clears many abnormal cells along the way — a concept known as immune surveillance.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#癌细胞 #p53 #免疫监视
器官移植后为什么会排斥？如何控制？
Why does organ rejection happen, and how is it controlled?
受者免疫系统把供者器官细胞表面的HLA（人类白细胞抗原）分子识别为“外来”，CD4+T细胞被激活后辅助B细胞产生抗体并激活杀伤性T细胞，攻击移植物，这就是排斥反应。临床对策有三层：术前HLA配型尽量匹配，术中术后用免疫抑制剂（钙调磷酸酶抑制剂、糖皮质激素、抗增殖药）抑制T细胞活化，长期监测以处理慢性排斥。急性排斥多数可逆；慢性排斥常与抗体介导的血管损伤有关，是移植物远期丢失的主因。
The recipient's immune system recognizes donor HLA (human leukocyte antigen) molecules on graft cells as foreign; CD4+ T cells are activated and help B cells make antibodies while activating CD8+ killers, which attack the graft—this is rejection. The clinical strategy has three layers: HLA matching before surgery to minimize mismatch, immunosuppressants (calcineurin inhibitors, glucocorticoids, antiproliferatives) to blunt T-cell activation, and long-term monitoring for chronic rejection. Acute rejection is mostly reversible; chronic rejection, often driven by antibody-mediated vascular injury, is the leading cause of late graft loss.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
NEJM（移植排斥机制）
NEJM (mechanisms of transplant rejection)
#移植免疫 #HLA配型 #免疫抑制
磁共振成像是靠什么"看见"软组织内部的？
What lets MRI "see" inside soft tissues?
人体含大量水分子，其中的氢质子像小磁针。MRI用强磁场让它们整齐排列，再用射频脉冲把质子激发到高能态；停止脉冲后质子按各自的"弛豫时间"（T1、T2）恢复，不同组织的T1/T2长短不同，计算机据此生成对比鲜明的图像。由于软组织的含水量和质子环境差异大，MRI在脑、脊髓、关节和软组织病变的显示上尤为突出；它没有电离辐射，主要考虑的是强磁场带来的安全禁忌（如体内金属植入物）。
The body is full of water, and its hydrogen protons behave like tiny magnets. MRI aligns them with a strong magnetic field, then flips them into a high-energy state with a radiofrequency pulse; when the pulse stops, protons relax at different rates (T1, T2), and tissues differ in these relaxation times, letting the computer build a high-contrast image. Because soft tissues differ widely in water content and proton environment, MRI is especially good at showing the brain, spinal cord, joints, and other soft-tissue lesions; it uses no ionizing radiation, with the main concerns being magnetic-field safety rules such as implant restrictions.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#磁共振 #弛豫时间 #质子
免疫系统为什么会"攻击自己"？
Why does the immune system sometimes attack the body itself?
正常情况下，发育中的T细胞和B细胞会在胸腺和骨髓里接受"教育"，自我反应的细胞被清除或抑制，这叫免疫耐受。耐受机制失效后，自身反应性淋巴细胞被激活，误将自身蛋白当作敌人攻击，便出现类风湿关节炎、1型糖尿病、桥本甲状腺炎等自身免疫病。遗传易感性和环境因素（如感染、药物）共同参与触发，治疗多围绕抑制异常免疫反应展开。
Normally, developing T and B cells are educated in the thymus and bone marrow, where self-reactive cells are deleted or suppressed — a process called immune tolerance. When tolerance fails, self-reactive lymphocytes become activated and attack self-proteins, producing diseases such as rheumatoid arthritis, type 1 diabetes, and Hashimoto's thyroiditis. Genetic susceptibility plus environmental triggers such as infections or drugs participate, and treatment generally focuses on dampening the aberrant immune response.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#自身免疫病 #免疫耐受 #类风湿关节炎
血糖是怎样被胰岛激素精确调节的？
How do pancreatic hormones precisely regulate blood glucose?
血糖升高时胰岛β细胞分泌胰岛素，促进肌肉和脂肪细胞摄取葡萄糖、促进糖原与脂肪合成，使血糖回落；血糖降低时α细胞分泌胰高血糖素，促进肝糖原分解和糖异生，使血糖回升。胰岛素与胰高血糖素作用相反，二者的比例决定肝脏输出葡萄糖的方向。交感兴奋和皮质醇、肾上腺素在应激时也协同升糖。这套系统失灵就表现为糖尿病。
Rising glucose makes β cells secrete insulin, which drives muscle and fat cells to take up glucose and promotes glycogen and fat synthesis, bringing glucose down; falling glucose makes α cells secrete glucagon, which stimulates hepatic glycogenolysis and gluconeogenesis to raise it. Insulin and glucagon oppose each other, and their ratio determines whether the liver releases or stores glucose. Sympathetic activation plus cortisol and adrenaline also raise glucose during stress. When this system fails, diabetes results.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《生理学》（胰岛素与糖代谢）
Textbook of Physiology (insulin and glucose metabolism)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117266598（豆瓣书目条目: 生理学）
#胰岛素 #胰高血糖素 #糖异生
血压是怎么升高的？为什么高血压常被称为"沉默杀手"？
How does blood pressure rise, and why is hypertension called a "silent killer"?
血压约等于心输出量乘以外周阻力。血管变硬变窄、肾素-血管紧张素系统过度激活、盐摄入过多等原因都会使阻力升高，血压随之上升。早期高血压几乎没有症状，但它长期损伤心、脑、肾和视网膜血管，等到出现症状时往往已有器官损害。
Blood pressure roughly equals cardiac output times peripheral resistance. Stiffer and narrower arteries, an overactive renin–angiotensin system, and excess salt all raise resistance and push pressure up. Early hypertension is symptom-free, yet it silently damages the heart, brain, kidneys, and retinal vessels; by the time symptoms appear, organ damage is often already present.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#高血压 #外周阻力 #靶器官损害
为什么受伤当下常常不太疼，过后才疼起来？
Why does an injury often not hurt at first, with pain arriving later?
这是应激性镇痛：危险或剧烈应激时，脑干的下行抑制系统（如中脑周围灰质—延髓通路）被激活，释放内源性阿片肽压制脊髓的痛信号传递，让人先逃生或应对。等应激缓解、炎症介质逐渐积累，疼痛便显现并可能加重。这说明疼痛不是简单的"损伤计量表"，而是被神经系统主动调节的体验。
This is stress-induced analgesia: danger or intense stress activates brainstem descending inhibition (the periaqueductal grey–medulla pathway), releasing endogenous opioids that suppress pain transmission in the spinal cord so you can escape or cope first. As stress subsides and inflammatory mediators accumulate, pain emerges and may intensify. Pain is not a simple damage meter but an experience actively modulated by the nervous system.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#应激镇痛 #下行调控
神经信号在神经元之间是怎样传递的？突触是怎么工作的？
How does a nerve signal travel between neurons, and how does a synapse work?
动作电位到达突触前膜后，触发含神经递质的小泡与膜融合并释放递质（如乙酰胆碱、谷氨酸）。递质扩散穿过突触间隙，与突触后膜上的受体结合，打开离子通道，产生兴奋性或抑制性突触后电位。递质随后被酶降解或回收，保证信号单向、可控地传递。
When an action potential reaches the presynaptic terminal, vesicles fuse with the membrane and release neurotransmitters such as acetylcholine or glutamate. These diffuse across the synaptic cleft and bind receptors on the postsynaptic membrane, opening ion channels and generating an excitatory or inhibitory postsynaptic potential. Enzymatic breakdown and reuptake then clear the transmitter, keeping signaling one-way and controlled.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#突触 #神经递质 #动作电位
下丘脑-垂体-肾上腺（HPA）轴是如何工作的？
How does the hypothalamus-pituitary-adrenal (HPA) axis work?
应激时下丘脑分泌CRH，促使垂体释放ACTH，ACTH再刺激肾上腺皮质合成皮质醇；皮质醇升高后反过来抑制CRH和ACTH的分泌，形成负反馈，让应激反应适度收尾。长期慢性应激或长期使用糖皮质激素会扰乱这一平衡，可能出现库欣样表现或肾上腺皮质抑制，这也是为什么激素类药物不能突然停用。
Under stress the hypothalamus releases CRH, prompting the pituitary to secrete ACTH, which drives the adrenal cortex to synthesize cortisol; rising cortisol then feeds back to suppress CRH and ACTH, closing the loop so the stress response tapers off. Chronic stress or long-term glucocorticoid use can disrupt this balance, producing Cushing-like features or adrenal suppression—which is why steroid drugs must never be stopped abruptly.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（内分泌调控）
Textbook of Physiology (endocrine regulation)
#HPA轴 #皮质醇 #糖皮质激素
人工智能（AI）怎样帮助医生诊断疾病？
How does artificial intelligence (AI) help doctors diagnose disease?
深度学习模型在大量标注的医学影像上训练后，可以学习识别胸片上的病灶、病理切片中的肿瘤、眼底照片中的糖尿病视网膜病变等，部分研究显示其灵敏度与专科医生相当甚至更高。AI还能整合电子病历做风险预测、加速药物发现。当前它定位为“辅助工具”，可以降低漏诊率、提高效率，但诊断责任和最终决策仍由医生承担。
Trained on large sets of labeled medical images, deep-learning models learn to spot lesions on chest X-rays, tumors in pathology slides, and diabetic retinopathy in retinal photos; some studies report sensitivity on par with or above specialists. AI also integrates electronic records for risk prediction and accelerates drug discovery. Today it is positioned as an assistive tool that reduces missed diagnoses and raises efficiency, while the final decision and responsibility remain with physicians.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Liu、Faes、Kale 等,《A comparison of deep learning performance against health-care professionals in detecting diseases from medical imaging: a systematic review and meta-analysis》,The Lancet Digital Health,2019 (DOI: 10.1016/s2589-7500(19)30123-2)
Liu, Faes, Kale et al., 'A comparison of deep learning performance against health-care professionals in detecting diseases from medical imaging: a systematic review and meta-analysis', The Lancet Digital Health, 2019, DOI: 10.1016/s2589-7500(19)30123-2
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1016/s2589-7500(19)30123-2
#人工智能 #辅助诊断 #深度学习
为什么慢性炎症被认为与许多现代疾病有关？
Why is chronic inflammation linked to so many modern diseases?
急性炎症是短期防御，而低度持续的炎症会让免疫介质长期作用于血管内皮、胰岛、肝脏与脑组织，促进动脉粥样斑块形成、胰岛素抵抗、脂肪肝与神经退行过程。肥胖、吸烟、睡眠不足、久坐和牙周疾病都可维持这种状态。目前证据支持通过改善生活方式而非随意服用"抗炎补剂"来干预。
Acute inflammation is short-term defence, but low-grade persistent inflammation keeps immune mediators acting on vascular endothelium, pancreatic islets, liver and brain, promoting atherosclerotic plaque, insulin resistance, fatty liver and neurodegenerative processes. Obesity, smoking, poor sleep, inactivity and gum disease all sustain it. Evidence supports lifestyle change rather than casually taking "anti-inflammatory" supplements.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#慢性炎症 #代谢疾病
为什么氧合血红蛋白解离曲线呈S形？
Why is the oxyhemoglobin dissociation curve S-shaped?
血红蛋白有4个氧结合位点，存在协同效应：第一个氧分子结合后亚基构象改变，使后续氧分子更容易结合，于是曲线低段平缓、中段陡峭。在组织处氧分压低、二氧化碳升高、pH下降和温度上升时，曲线右移，血红蛋白在相同氧分压下释放更多氧；肺部则相反，利于充分携氧。运动中的肌肉正是靠这种右移获得更多氧气。
Hemoglobin has four oxygen-binding sites that cooperate: after the first oxygen binds, subunit conformational changes make the next bind more easily, so the curve is flat at low pressures and steep in the middle. In tissues, where oxygen tension is low and CO2, acidity, and temperature are higher, the curve shifts right, releasing more oxygen at the same partial pressure; in the lungs the opposite favors full loading. Exercising muscle depends on exactly this rightward shift for extra oxygen.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（血液气体运输）
Textbook of Physiology (respiratory gas transport)
#氧离曲线 #血红蛋白 #波尔效应
什么是生物标志物？它在精准医疗中起什么作用？
What are biomarkers, and what role do they play in precision medicine?
生物标志物是可以客观测量的生理或病理指标，包括血液蛋白、基因突变、影像特征等。肿瘤治疗中，HER2、EGFR、ALK等分子标志物直接决定能否使用相应靶向药；KRAS突变等则提示特定药物无效。治疗后监测循环肿瘤DNA（ctDNA）等标志物还能比影像更早发现微小残留或复发。精准医疗正是靠这些标志物把患者细分到真正受益的治疗组。
Biomarkers are objectively measurable indicators of normal or pathological states, including blood proteins, gene mutations, and imaging features. In oncology, molecular markers such as HER2, EGFR, and ALK directly determine eligibility for specific targeted drugs, while mutations like KRAS predict that certain drugs will fail. After treatment, monitoring markers such as circulating tumor DNA (ctDNA) can detect minimal residual disease or relapse earlier than imaging. Precision medicine relies on exactly these markers to assign patients to treatments that actually benefit them.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature Medicine（精准肿瘤学）
Nature Medicine (precision oncology)
#生物标志物 #精准医疗 #ctDNA
免疫记忆是怎么形成并长期保留的？
How is immune memory formed and kept for years?
初次感染或接种后，识别该抗原的B细胞和T细胞大量扩增，其中一部分不参与即时战斗，而分化为长寿的记忆细胞，分布在淋巴结、骨髓和组织中；部分浆细胞长期驻留骨髓持续产生抗体。再次遇到同一抗原时，反应速度和抗体亲和力都大幅提升。不同病原的记忆持久性差异很大，这解释了为什么有的疫苗需要加强针。
After a first infection or vaccination, B and T cells recognising the antigen expand massively, and some differentiate into long-lived memory cells residing in lymph nodes, bone marrow and tissues, while long-lived plasma cells in marrow keep secreting antibody. On re-exposure the response is far faster and antibodies bind better. Durability varies by pathogen, which is why some vaccines need boosters.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#免疫记忆 #记忆细胞
动脉里的粥样硬化斑块是怎么形成的？
How do atherosclerotic plaques form in arteries?
血液中长期偏高的低密度脂蛋白（LDL）进入受损的血管内膜并被氧化，巨噬细胞吞噬后变成充满脂质的泡沫细胞，逐步形成脂质核心和纤维帽，这就是粥样斑块。高血压、吸烟和糖尿病会损伤血管内皮，为LDL的沉积创造条件，因此这些危险因素会相互叠加。斑块若不稳定而破裂，血小板会在表面聚集形成血栓，堵塞血管导致心肌梗死或脑卒中。
Chronically elevated LDL cholesterol enters the damaged artery wall and becomes oxidized; macrophages engulf it and turn into lipid-laden foam cells, gradually building a lipid core covered by a fibrous cap — the atherosclerotic plaque. High blood pressure, smoking, and diabetes damage the endothelium, creating the conditions for LDL to deposit, which is why these risk factors compound each other. If an unstable plaque ruptures, platelets clot on its surface and the thrombus can block the vessel, causing a heart attack or stroke.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#动脉粥样硬化 #LDL #血栓
为什么心脏的“复极”和心律失常密切相关？
Why is cardiac repolarization closely tied to arrhythmias?
心肌细胞动作电位比神经长得多，因为2期"平台期"中钙离子内流与钾离子外流大致平衡，这延长了不应期，防止心肌在完全恢复前被再次兴奋，保证泵血有序。若基因突变或药物（某些抗生素、抗心律失常药）使钾通道功能受损，复极延迟，心电图上表现为QT间期延长，容易诱发"尖端扭转型室速"等恶性心律失常。因此用药后复查心电图监测QT是常规安全措施。
Cardiac action potentials last far longer than nerve ones because of a plateau phase (phase 2) where calcium influx roughly balances potassium efflux; this lengthens the refractory period, preventing re-excitation before full recovery and keeping pumping orderly. If gene mutations or drugs—certain antibiotics and antiarrhythmics—impair potassium channels, repolarization slows and the QT interval lengthens on the ECG, predisposing to malignant arrhythmias such as torsades de pointes. That is why checking the ECG after starting such drugs is standard practice.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《内科学》（心律失常）
Textbook of Internal Medicine (cardiac arrhythmias)
#心肌复极 #QT间期 #尖端扭转
细菌是怎样让人生病的？
How do bacteria make people sick?
致病菌先黏附并定植在黏膜或组织表面，避开免疫防线大量繁殖，再通过外毒素（如白喉毒素）或内毒素（革兰阴性菌细胞壁成分）损伤组织、诱发炎症，发热和疼痛等很多症状其实来自免疫系统对感染的应答。抗生素恰好可以靶向细菌独有的结构，如抑制细胞壁合成（青霉素类）或细菌核糖体（四环素类），从而相对"精准"地清除它们而不伤害人体细胞。
Pathogenic bacteria first adhere to and colonize mucosal or tissue surfaces, evade immune defenses, and multiply, then damage tissues through exotoxins (e.g., diphtheria toxin) or endotoxins (a cell-wall component of Gram-negative bacteria) that trigger inflammation; much of the fever and pain in infection is actually the immune system's response. Antibiotics work by targeting bacterial-specific structures — such as cell-wall synthesis (penicillins) or the bacterial ribosome (tetracyclines) — giving them relative precision against bacteria while sparing human cells.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Bennett JE主编专著《Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases》第9版,Elsevier
Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases, 9th edition, edited by John E. Bennett, Elsevier
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780323482554 (2019)
#致病菌 #外毒素 #内毒素
为什么紧张的时候会肚子疼、想上厕所？
Why does stress cause stomach ache or an urge to go to the toilet?
肠道有自己的"肠神经系统"，通过迷走神经和脊髓与大脑双向连接，这就是脑—肠轴。压力时交感激活与皮质醇、CRF等激素改变肠道运动与分泌，使肠蠕动加快、内脏敏感性升高，于是出现腹痛与急迫感。这也是肠易激综合征常在压力下加重的原因之一。持续症状应就医评估。
The gut has its own enteric nervous system linked bidirectionally to the brain via the vagus nerve and spinal cord — the gut–brain axis. Under stress, sympathetic activation and hormones such as cortisol and CRF change gut motility and secretion, speeding transit and heightening visceral sensitivity, producing cramps and urgency. It is one reason irritable bowel syndrome flares with stress. Persistent symptoms deserve evaluation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#脑肠轴 #压力与消化
为什么病毒比细菌更难对付？
Why are viruses harder to fight than bacteria?
病毒没有独立的代谢系统和核糖体，必须劫持宿主细胞内的机器来复制自己，因此很多抗病毒药必须进入细胞，干扰病毒特有的酶（如逆转录酶、蛋白酶）或阻断其进入和组装。抗生素攻击的是细菌特有结构，对病毒无效，这就是感冒多靠对症和自愈、而不是吃"消炎药"的原因。病毒基因组小、变异又快，免疫记忆和药物都可能"追不上"新变体，这也是流感疫苗需要每年更新的原因。
Viruses lack their own metabolism and ribosomes, so they must hijack host-cell machinery to replicate; many antiviral drugs therefore enter cells and inhibit virus-specific enzymes such as reverse transcriptase or protease, or block entry and assembly. Antibiotics attack bacterial-specific structures and are useless against viruses, which is why colds are managed symptomatically rather than with "anti-inflammatory" pills. Their small, fast-mutating genomes mean both immune memory and drugs may lag behind new variants — a key reason flu vaccines are updated yearly.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#病毒复制 #抗病毒药 #变异
肾髓质的高渗梯度是如何建立起来的？
How is the hypertonic gradient in the renal medulla established?
髓质高渗梯度主要靠髓袢的“逆流倍增”建立：髓袢升支粗段主动重吸收NaCl但对水不通透，把小管液稀释的同时把间质变浓；降支则对水通透，水分被高渗间质“吸出”使小管液浓缩。升支排出的水和溶质在降支-升支间循环，使间质渗透压从皮质到肾乳头逐步升高。这个梯度为抗利尿激素（ADH）浓缩尿液提供了渗透动力，是肾脏浓缩功能的基础。
The medullary osmotic gradient is built mainly by the countercurrent multiplier of the loop of Henle: the thick ascending limb actively reabsorbs NaCl but is impermeable to water, diluting the tubular fluid while concentrating the interstitium; the descending limb is water-permeable, and water is drawn out by the hypertonic interstitium, concentrating the fluid. Solute and water cycling between the two limbs raises interstitial osmolality progressively from cortex to papilla. This gradient supplies the osmotic driving force for antidiuretic hormone (ADH) to concentrate urine—the basis of renal concentrating ability.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《生理学》（尿的浓缩与稀释）
Textbook of Physiology (urine concentration and dilution)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117266598（豆瓣书目条目: 生理学）
#逆流倍增 #髓袢 #尿液浓缩
什么是通气/血流比例（V/Q）失衡？
What is ventilation/perfusion (V/Q) mismatch?
气体交换的有效性取决于每个肺泡的通气量（V）和灌注血量（Q）是否匹配，全肺理想比值约为0.84。通气不足而血流正常（如气道阻塞、肺不张）时形成“分流样”效应，血液流经未被充分氧合的肺泡；血流不足而通气正常（如肺栓塞）则形成“无效腔样”效应。两种失衡都会降低动脉血氧分压，机体通过缺氧性肺血管收缩等机制局部代偿。
Gas exchange efficiency depends on matching ventilation (V) and perfusion (Q) in each alveolus; the whole-lung ideal ratio is about 0.84. Low ventilation with normal flow—as in airway obstruction or atelectasis—creates a “shunt-like” effect where blood passes poorly oxygenated alveoli; low flow with normal ventilation—as in pulmonary embolism—creates a “dead-space-like” effect. Both lower arterial oxygen tension, and the body compensates locally through mechanisms such as hypoxic pulmonary vasoconstriction.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《内科学》（呼吸生理与疾病）
Textbook of Internal Medicine (respiratory physiology and disease)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117265416（豆瓣书目条目: 内科学）
#通气血流比 #肺栓塞 #低氧血症
阿尔茨海默病患者的大脑发生了什么？
What happens in the brain of someone with Alzheimer's disease?
典型特征是脑内β-淀粉样蛋白在细胞外沉积形成"斑块"，tau蛋白过度磷酸化在细胞内形成"神经原纤维缠结"。这些异常蛋白逐渐损伤并杀死神经元，破坏记忆所需的突触连接和乙酰胆碱等递质系统，最先波及海马等记忆相关区域。随病程进展损害蔓延到其他脑区，最终导致记忆衰退、认知障碍和日常生活能力下降。
The hallmarks are extracellular plaques of beta-amyloid and intracellular neurofibrillary tangles of hyperphosphorylated tau. These deposits progressively damage and kill neurons, disrupt the synapses and cholinergic (acetylcholine) systems needed for memory, and first hit memory-critical regions such as the hippocampus. As the disease spreads to other brain areas, it produces worsening memory loss, cognitive decline, and loss of ability to manage daily life.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#阿尔茨海默 #β-淀粉样蛋白 #tau蛋白
肾素-血管紧张素-醛固酮系统（RAAS）是怎样调节血压的？
How does the renin-angiotensin-aldosterone system (RAAS) regulate blood pressure?
当肾动脉压下降、交感兴奋或远曲小管液钠减少时，球旁细胞释放肾素，把肝合成的血管紧张素原切为血管紧张素I，后者再被ACE转化为血管紧张素II。血管紧张素II是强效缩血管物质，还刺激肾上腺皮质分泌醛固酮（保钠排钾、水随钠重吸收）并促进抗利尿激素释放。三者协同升高血压、恢复血容量。ACE抑制剂等降压药正是阻断这一通路来降压的。
When renal perfusion pressure falls, sympathetic tone rises, or sodium in the distal tubule decreases, juxtaglomerular cells release renin, which cleaves liver-derived angiotensinogen into angiotensin I; ACE then converts it to angiotensin II. Angiotensin II is a potent vasoconstrictor that also stimulates aldosterone from the adrenal cortex (retaining sodium and water, excreting potassium) and promotes antidiuretic hormone release. Together these raise blood pressure and restore blood volume—which is exactly why ACE inhibitors lower blood pressure by blocking this pathway.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（血压的调节）
Textbook of Physiology (regulation of blood pressure)
#RAAS #肾素 #血管紧张素II #醛固酮
肌肉收缩的分子机制是怎样的？为什么需要钙？
What is the molecular mechanism of muscle contraction, and why does it need calcium?
神经冲动到达肌肉后，终板电位引发肌浆网释放钙离子。钙与肌钙蛋白结合，使原肌球蛋白移位、露出肌动蛋白上的结合位点，肌球蛋白横桥随即附着并拉动肌丝滑行，这就是"肌丝滑行"模型。肌肉松弛时，钙被泵回肌浆网，横桥解离。
A nerve impulse at the neuromuscular junction triggers release of calcium from the sarcoplasmic reticulum. Calcium binds troponin, shifting tropomyosin to expose actin binding sites so myosin cross-bridges can attach and pull the filaments — the sliding-filament model. On relaxation, calcium is pumped back into the SR and cross-bridges detach.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#肌丝滑行 #肌钙蛋白 #钙离子
为什么钠钾泵会消耗神经元静息时的大部分ATP？
Why does the sodium-potassium pump consume most of a neuron's resting ATP?
为维持膜内外钠钾浓度差，钠钾泵每循环把3个Na+泵出、2个K+泵入，直接水解ATP供能。神经元静息时仍要不断对抗离子的漏流以保住约-70 mV的静息电位，这项主动运输可占脑细胞能量消耗的近一半。一旦泵停转，梯度迅速崩溃、细胞无法正常兴奋。
To keep Na and K gradients, the pump pushes 3 Na+ out and 2 K+ in per cycle, spending ATP directly. Even at rest the neuron must counter constant ion leak to hold its ~-70 mV potential, so this active transport can take close to half of brain cell energy. Stop the pump and gradients collapse, and the cell cannot fire normally.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
王庭槐主编《生理学》第9版，人民卫生出版社，2018年
王庭槐主编《生理学》第9版，人民卫生出版社，2018年
#钠钾泵 #静息电位 #ATP #神经元
1型和2型糖尿病在机制上有什么不同？
How do type 1 and type 2 diabetes differ in mechanism?
1型糖尿病是自身免疫破坏了胰岛β细胞，导致胰岛素绝对缺乏，常在青少年期发病，必须终身依赖外源胰岛素。2型糖尿病以胰岛素抵抗为主——细胞对胰岛素的反应变钝，血糖难以进入细胞——并伴随β细胞分泌功能逐渐下降，与肥胖、久坐和遗传有关。因此2型患者往往可以先从饮食、运动和减重等生活方式干预入手，效果不足再升级到口服药或胰岛素。
Type 1 diabetes results from autoimmune destruction of pancreatic beta cells, causing absolute insulin deficiency; it usually begins in youth and requires lifelong insulin. Type 2 diabetes is driven mainly by insulin resistance — cells respond sluggishly to insulin, so glucose cannot enter them easily — along with progressive beta-cell failure, and is linked to obesity, inactivity, and genetics. For this reason type 2 is often managed starting with diet, exercise, and weight loss, escalating to oral drugs or insulin only when needed.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#1型糖尿病 #2型糖尿病 #胰岛素抵抗
为什么呼吸深浅比频率更重要？
Why does breathing depth matter more than frequency?
每次吸气约有150毫升停留在气道内不参与气体交换，称为解剖无效腔。真正到达肺泡参加换气的是“肺泡通气量”，等于（潮气量－无效腔）×呼吸频率。浅快呼吸时大量气量浪费在无效腔，即使每分钟总通气量不变，肺泡通气量也会明显下降甚至导致缺氧。这也是为什么呼吸窘迫时浅快呼吸比深慢呼吸更危险。
Each breath leaves about 150 mL in the airways where no gas exchange occurs—the anatomic dead space. What actually reaches the alveoli is alveolar ventilation, equal to (tidal volume − dead space) × respiratory rate. With rapid shallow breathing, a large fraction is wasted in dead space, so even if total minute ventilation stays the same, alveolar ventilation can fall sharply and cause hypoxia. That is why rapid shallow breathing is more dangerous than slow deep breathing in respiratory distress.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（肺通气）
Textbook of Physiology (pulmonary ventilation)
#肺泡通气量 #解剖无效腔 #潮气量
为什么甲状腺激素水平能保持稳定？
How does the body keep thyroid hormone levels stable?
下丘脑分泌TRH刺激垂体释放TSH，TSH再促使甲状腺分泌T3和T4；当血中T3、T4升高时，它们反过来抑制TRH和TSH的分泌。这一负反馈回路让甲状腺功能自动维持在合适范围。甲状腺功能检查（TSH）正是因为这套机制而非常敏感。
The hypothalamus releases TRH, which makes the pituitary secrete TSH, and TSH stimulates the thyroid to produce T3 and T4. When blood levels of T3 and T4 rise, they feed back to suppress TRH and TSH. This negative-feedback loop keeps thyroid function automatically within range, which is why TSH is such a sensitive thyroid function test.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（甲状腺激素）
Textbook of Physiology (thyroid hormones)
#甲状腺 #负反馈 #TSH
幽门螺杆菌和胃溃疡有什么关系？
How is Helicobacter pylori related to stomach ulcers?
幽门螺杆菌是能在胃酸中生存的细菌，通过分泌尿素酶中和局部胃酸并损伤胃黏膜，是绝大多数消化性溃疡的病因，也与慢性胃炎和胃癌相关。多数感染者没有症状，检出且合并溃疡或高风险时，规范的“四联疗法”可以根除。治疗后复查确认根除能显著降低溃疡复发。
Helicobacter pylori is a bacterium that survives stomach acid by secreting urease to neutralize acid locally while damaging the gastric lining; it causes the majority of peptic ulcers and is linked to chronic gastritis and gastric cancer. Most infected people have no symptoms, but when found with an ulcer or high risk, standard quadruple therapy can eradicate it. A follow-up test confirming eradication greatly lowers ulcer recurrence.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#幽门螺杆菌 #胃溃疡 #根除治疗
为什么人突然站起来时会头晕眼花？
Why do people sometimes feel dizzy when they stand up suddenly?
站立时血液因重力暂时积聚在下肢，回心血量和血压短暂下降。颈动脉窦和主动脉弓的压力感受器感知血压降低后，通过自主神经反射加快心率并收缩血管，让血压在几秒内恢复。若这一反射较慢或代偿不足（如老年人、脱水或服用某些降压药时），就会出现眼前发黑甚至晕厥，医学上称为体位性低血压，起身时放慢速度可以有效预防。
When you stand, gravity briefly pools blood in the lower limbs, so venous return and blood pressure dip for a moment. Baroreceptors in the carotid sinus and aortic arch detect the drop and, via autonomic reflexes, speed up the heart and constrict vessels so blood pressure recovers within seconds. If this reflex is slow or insufficient—in older adults, dehydration, or with certain blood pressure medications—you may feel light-headed or even faint, a condition called orthostatic hypotension. Standing up slowly can help prevent it.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#血压调节 #压力感受器 #体位性低血压
为什么长时间盘腿或压着手臂会"麻"？
Why does a limb go numb and tingly after sitting cross-legged too long?
持续压迫使局部神经的血液供应减少、神经传导暂时受阻，感觉信号变得混乱，出现麻木与针刺感。恢复供血后，神经末梢一起"重新上线"，产生密集的异常放电，就是那种发麻刺痒的感觉。偶尔发生无需担心，若频繁出现或伴肌力下降，应就医评估神经受压情况。
Sustained pressure reduces blood supply to a nerve and temporarily blocks conduction, so sensory signals become garbled and you feel numbness and pins and needles. When flow returns, nerve endings come back online together, firing abnormally in a burst — that prickly tingle. Occasional episodes are harmless, but frequent numbness or weakness deserves evaluation for nerve compression.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#肢体麻木 #神经受压
我们吃进去的脂肪是如何被消化吸收的？
How is dietary fat digested and absorbed?
脂肪先在胆盐的乳化作用下分散成小油滴，再由胰脂肪酶分解为脂肪酸和甘油一酯。这些产物与胆盐形成微胶粒，被小肠上皮细胞吸收后重新合成甘油三酯，组装成乳糜微粒，经淋巴系统最终进入血液。因此脂肪的消化吸收比碳水更复杂，速度也更慢。
Dietary fat is first emulsified into small droplets by bile salts, then broken down by pancreatic lipase into fatty acids and monoglycerides. Together with bile salts these form micelles that enter intestinal cells, where triglycerides are rebuilt and packaged into chylomicrons that travel via the lymph into the bloodstream. That is why fat digestion and absorption are more complex and slower than those of carbohydrates.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（消化与吸收）
Textbook of Physiology (digestion and absorption)
#脂肪消化 #胰脂肪酶 #乳糜微粒
尿液是怎么在肾脏里形成的？
How does the kidney make urine?
血液流经肾小球时，水和小分子被滤出形成原尿；肾小管随后把葡萄糖、氨基酸和大部分水分重新吸收回血液，同时分泌一部分废物。健康人的尿液基本不含糖和蛋白质，这正是肾小管重吸收功能强大的体现。
As blood flows through the glomerulus, water and small molecules are filtered out to form a primary filtrate. Tubules then reabsorb glucose, amino acids, and most of the water back into the blood while secreting extra waste. Healthy urine contains essentially no sugar or protein — a sign of how efficient tubular reabsorption is.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#肾小球 #肾小管 #重吸收
手指碰到热水为什么会先缩回来，然后才感觉到烫？
Why does your hand pull back from hot water before you actually feel the heat?
这是一种脊髓反射。感受烫伤的信号沿感觉神经进入脊髓后，脊髓直接发出指令让手臂肌肉收缩，整个过程比信号传到大脑再下达命令快得多。与此同时信号继续上传大脑，所以你随后才产生"烫"的感觉。
This is a spinal reflex. The heat signal travels up a sensory nerve to the spinal cord, which immediately sends a command for your arm muscles to pull away — much faster than routing the signal up to the brain and back. The signal also continues to the brain, which is why you feel the heat a moment later.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#反射弧 #脊髓 #神经传导
心房颤动（房颤）是什么？为什么需要重视？
What is atrial fibrillation and why does it matter?
房颤时心房不再规律收缩，而是快速、不规则地颤动，导致心跳快慢不一。最大的风险是心房内血流淤滞形成血栓，血栓脱落随血流堵塞脑血管就会引起脑卒中。房颤患者通过抗凝治疗、控制心率和恢复节律，可以大幅降低卒中风险。
In atrial fibrillation the atria stop contracting rhythmically and quiver rapidly and irregularly, making the heartbeat uneven. The main danger is that stagnant blood in the atria can form clots; if a clot breaks off and blocks a brain vessel it causes a stroke. With anticoagulation, rate control, and rhythm management, stroke risk can be greatly reduced.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#心律失常 #心房颤动 #脑卒中预防
为什么得过一次水痘之后通常就不会再得？
Why do people who have had chickenpox usually never get it again?
初次感染时，免疫系统会生成专门识别水痘病毒的记忆B细胞和记忆T细胞。病毒再次入侵时，记忆细胞能在几天内迅速增殖并产生大量抗体，在病毒大量繁殖前就把它们清除。疫苗能带来类似的记忆，所以接种后也能获得保护。
During the first infection, the immune system creates memory B cells and T cells that recognize the chickenpox virus. If the virus returns, these memory cells multiply within days and produce antibodies that clear it before it can spread widely. Vaccines create the same kind of memory, which is why vaccination offers protection too.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#免疫记忆 #记忆细胞 #抗体
血液中的“补体”是什么？它有什么作用？
What is the "complement" in blood, and what does it do?
补体是一组存在于血浆中的蛋白质，平时处于“待命”状态，遇到病原体或被抗体结合后会被逐级激活。激活后的补体主要有三件事可做：标记病原体让吞噬细胞吞掉（调理）、招募免疫细胞到感染部位、以及直接穿孔溶解细菌。它是固有免疫的重要防线，也帮助适应性免疫发挥作用。
Complement is a group of plasma proteins that stand by in the blood and are activated in a cascade when they encounter pathogens or antibody-antigen complexes. Once activated, complement does three main jobs: tags pathogens for phagocytes to engulf (opsonization), recruits immune cells to the infection site, and punches holes in bacterial membranes to kill them. It is a key arm of innate immunity and also assists adaptive immunity.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#补体 #固有免疫 #吞噬作用
伤口愈合分哪几个阶段？
What are the stages of wound healing?
大致四步：止血（血管收缩、血小板聚集形成血栓）、炎症（白细胞清理细菌与坏死组织）、增生（成纤维细胞铺设胶原、新生血管长入、上皮细胞爬行覆盖）、重塑（胶原重新排列、瘢痕逐渐变淡，可持续数月到一年）。营养不良、血糖控制差、吸烟和局部血流不足都会拖慢这个过程。
Roughly four: haemostasis (vessels constrict, platelets clot), inflammation (white cells clear bacteria and dead tissue), proliferation (fibroblasts lay collagen, new vessels grow in, epithelium migrates across), and remodelling (collagen realigns and the scar fades over months to a year). Poor nutrition, poor glucose control, smoking and low local blood flow all slow it down.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#伤口愈合 #组织修复
基因检测能预测我将来会得什么病吗？
Can genetic testing predict what diseases I will get?
对少数单基因病（如亨廷顿病），致病基因明确，预测性较强；但对高血压、糖尿病这类多因素疾病，基因只提供一部分风险，环境与生活方式影响更大。检测报告需要专业人员解读，避免过度焦虑或盲目乐观。
For a few single-gene diseases like Huntington's, the causative gene is clear and prediction is strong. But for common conditions such as hypertension and diabetes, genes contribute only part of the risk — environment and lifestyle matter more. Results should be interpreted by professionals to avoid unnecessary anxiety or false reassurance.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#基因检测 #单基因病 #多基因风险
B超为什么能"看见"肚子里的胎儿？
How can ultrasound "see" a baby in the womb?
探头向体内发射高频声波，不同组织界面对声波的反射不同，返回的回声被探头接收并变成图像。超声没有电离辐射，是目前孕检最常用的成像手段；涂在肚子上的凝胶是为了让声波顺利进入皮肤。
The probe sends high-frequency sound waves into the body; boundaries between different tissues reflect them differently, and the returning echoes are turned into an image. Ultrasound uses no ionizing radiation, making it the standard imaging tool in pregnancy; the gel on the belly lets sound waves pass smoothly into the skin.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#超声 #回声 #产检
肺功能检查里的FEV1和FVC代表什么？
What do FEV1 and FVC mean in a lung function test?
FEV1是第一秒用力呼出的气量，FVC是尽力吸足后一口气呼出的总量。两者的比值反映气道通畅程度：哮喘和慢阻肺等阻塞性肺病中FEV1/FVC下降，而肺纤维化等限制性肺病中比值接近正常但总气量减少。医生根据这两个指标帮助区分不同性质的肺部疾病。
FEV1 is the volume forcibly exhaled in the first second; FVC is the total volume exhaled after a full breath in. Their ratio reflects how open the airways are: in obstructive diseases like asthma and COPD the FEV1/FVC ratio falls, while in restrictive diseases like pulmonary fibrosis the ratio stays near normal but total volumes are low. Doctors use these numbers to tell the two types of lung disease apart.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《内科学》（肺功能检查）
Textbook of Internal Medicine (pulmonary function tests)
#肺功能 #FEV1/FVC #呼吸系统疾病
CT和普通X光有什么不一样？
How is a CT scan different from a plain X-ray?
CT让X光管绕身体旋转扫描，在不同角度拍摄大量投影，再由计算机重建出横断面的断层图像。它能分辨密度差别很小的软组织结构，定位更精确，但辐射剂量通常比单张X光高，所以医生只在必要时才开CT。
A CT scanner rotates the X-ray tube around the body, taking many projections at different angles, and a computer reconstructs cross-sectional images. It can tell apart soft tissues with very similar density and locates structures precisely, but the radiation dose is usually higher than a single X-ray, so doctors order CTs only when needed.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#CT #断层成像 #辐射剂量
蛀牙（龋齿）是怎么形成的？怎么预防？
How do cavities form, and how can they be prevented?
龋齿是牙齿表面细菌把糖发酵产酸，酸长期溶解牙釉质矿物质形成的。早期只是牙釉质脱矿，可逆；发展深入后形成龋洞，就需要补牙或更复杂的治疗。预防的核心是减少糖的摄入频率、每天两次含氟牙膏刷牙和用牙线，氟化物能促进再矿化、抑制细菌产酸。
Cavities form when bacteria on the teeth ferment sugar into acid that over time dissolves minerals out of the enamel. Early demineralization is reversible; once a cavity develops, it needs fillings or more complex treatment. Prevention hinges on cutting down how often you eat sugar, brushing twice daily with fluoride toothpaste, and flossing—fluoride promotes remineralization and suppresses acid production by bacteria.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#龋齿 #牙釉质 #氟化物
疼痛信号在体内是怎样传递的？为什么急性和慢性疼痛不一样？
How are pain signals transmitted in the body, and why is chronic pain different from acute pain?
组织受损时释放的炎症物质激活伤害感受器，信号沿神经上行，经脊髓传递到丘脑，再投射到大脑皮层产生痛觉。急性疼痛是及时的“报警”信号，提醒我们避开伤害；慢性疼痛则是疼痛通路持续过度兴奋或中枢敏化，报警功能已经失灵，需要专门的管理和治疗。
When tissue is damaged, inflammatory chemicals activate nociceptors, and signals travel up the spinal cord to the thalamus and then to the cerebral cortex, where pain is perceived. Acute pain is a timely alarm that makes us avoid harm; chronic pain reflects persistent over-excitation or central sensitization of pain pathways, so the alarm has broken down and needs dedicated management and treatment.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《生理学》（躯体感觉与疼痛）
Textbook of Physiology (somatic sensation and pain)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117266598（豆瓣书目条目: 生理学）
#疼痛机制 #伤害感受器 #慢性疼痛
辅助性T细胞和杀伤性T细胞分别做什么？
What do helper T cells and killer T cells each do?
辅助性T细胞（CD4+）像是免疫系统的“指挥官”，分泌细胞因子指挥B细胞产抗体、激活巨噬细胞；杀伤性T细胞（CD8+）则是“士兵”，直接识别并清除被病毒感染的细胞和肿瘤细胞。艾滋病病毒正是主要攻击CD4+细胞，导致指挥系统崩溃，所以晚期会出现各种机会性感染。
Helper T cells (CD4+) act like the commanders of the immune system, releasing cytokines that direct B cells to make antibodies and activate macrophages; killer T cells (CD8+) are the soldiers that directly recognize and destroy virus-infected cells and tumor cells. HIV mainly attacks CD4+ cells, crippling the command system, which is why advanced AIDS brings opportunistic infections.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#T细胞 #CD4 #CD8
氧气在肺里是怎么进入血液的？
How does oxygen get from the lungs into the blood?
肺泡壁只有一层薄薄的上皮细胞，外面又包裹着密密麻麻的毛细血管，两者紧贴在一起。氧气凭借浓度差从肺泡扩散进血液，被红细胞里的血红蛋白结合带走；血液中的二氧化碳则反向扩散进肺泡呼出体外。
Alveolar walls are a single thin layer of cells wrapped in dense capillaries, so air and blood sit almost directly against each other. Oxygen diffuses down its concentration gradient from the alveoli into the blood, where hemoglobin in red cells picks it up, while carbon dioxide diffuses back into the air you breathe out.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#肺泡 #气体扩散 #血红蛋白
发烧时为什么会先觉得冷、还打寒战？
Why do you feel cold and shiver when a fever starts?
调定点被上调后，身体认为当前体温"太低"，于是启动产热与保温：皮肤血管收缩（所以手脚发凉）、肌肉快速不自主收缩产热（寒战）。等实际体温升到新调定点，寒冷感就消失；退热时调定点回落，身体又觉得"太热"而大量出汗。
Once the set point rises, the body judges its current temperature too low and switches on heat production and conservation: skin vessels constrict (cold hands and feet) and muscles contract rapidly and involuntarily to generate heat (shivering). When actual temperature reaches the new set point, the chill fades; as the fever breaks, the set point drops and the body feels too hot, so you sweat heavily.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#寒战 #发热过程
吃完饭血糖为什么会先升高再降回正常？
Why does blood sugar rise after a meal and then return to normal?
食物中的碳水化合物被消化成葡萄糖进入血液，血糖随之升高。胰腺随即分泌胰岛素，帮助葡萄糖进入肌肉和脂肪细胞，并促使肝脏把多余葡萄糖储存为糖原，于是血糖回落到正常范围。血糖过低时，胰高血糖素又会促使糖原分解，把血糖拉上来。
Carbs are digested into glucose that enters the blood, pushing blood sugar up. The pancreas then releases insulin, which helps muscle and fat cells take up glucose and prompts the liver to store surplus as glycogen, bringing levels back down. If glucose runs low, glucagon triggers glycogen breakdown to raise it again.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#胰岛素 #血糖调节 #胰高血糖素
大脑是如何精确控制每一块肌肉的？
How does the brain control muscles with such precision?
大脑运动皮层发出指令，经皮质脊髓束传至脊髓前角运动神经元；一个运动神经元连同它所支配的全部肌纤维合称一个运动单位。负责精细动作的肌肉（如手指）运动单位小、单个神经元支配的纤维少，控制更精准；大腿等大肌群的运动单位则很大。小脑和基底节负责协调与平衡，让动作平滑流畅。
The motor cortex sends commands down the corticospinal tract to motor neurons in the spinal cord; one motor neuron plus all the muscle fibers it innervates is called a motor unit. Muscles used for fine movements, like those of the fingers, have small motor units with few fibers per neuron, allowing precise control, while large muscles like the thigh have big motor units. The cerebellum and basal ganglia coordinate and balance movements to keep them smooth.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《生理学》（运动控制）
Textbook of Physiology (motor control)
#运动控制 #运动单位 #运动皮层
为什么感染时身体会发烧？
Why does the body raise its temperature during infection?
免疫细胞识别病原后释放白介素-1、-6和TNF等细胞因子，作用于下丘脑，使前列腺素E2生成增加，把体温"调定点"上调。较高体温可抑制部分病原繁殖并增强免疫细胞活性。所以发烧是防御反应，而不是疾病本身；退热药通过抑制前列腺素合成把调定点降回来。
Immune cells detect pathogens and release cytokines such as IL-1, IL-6 and TNF, which act on the hypothalamus to raise prostaglandin E2 and reset the temperature set point upward. A higher temperature can slow some pathogens and boost immune cell activity. Fever is therefore a defence, not the disease itself; antipyretics lower the set point by blocking prostaglandin synthesis.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#发烧 #体温调定点
心跳的"扑通、扑通"两声是什么声音？
What are the two "lub-dub" sounds of a heartbeat?
第一声"扑"来自房室瓣关闭，标志心室开始收缩；第二声"通"来自主动脉瓣和肺动脉瓣关闭，标志心室开始舒张。医生用听诊器听这两声，可以初步判断心脏瓣膜是否正常。
The first "lub" comes from the atrioventricular valves closing as the ventricles start to contract; the second "dub" comes from the aortic and pulmonary valves closing as the ventricles relax. Doctors listen to these two sounds to check whether the heart valves are working properly.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#心动周期 #心脏瓣膜 #心音
肾脏每天滤出约180升原尿，为什么人每天只排出1-2升尿？
The kidneys filter about 180 liters of fluid a day—why do we only pass 1–2 liters of urine?
肾小球每天确实滤出约180升原尿，但约99%会被肾小管重吸收回血液。近端小管负责回收大部分水、钠、葡萄糖和氨基酸，髓袢与远端小管再做精细调节，最终只剩1-2升以尿液形式排出。血糖过高超过“肾糖阈”时，葡萄糖才会出现在尿里，这也是糖尿病检测的原理之一。
The glomeruli indeed filter about 180 liters daily, but roughly 99% is reabsorbed by the tubules. The proximal tubule recovers most water, sodium, glucose, and amino acids; the loop of Henle and distal tubule fine-tune the rest, leaving only 1–2 liters as urine. Only when blood glucose exceeds the renal threshold does glucose spill into the urine—one principle behind diabetes testing.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《生理学》（尿生成与重吸收）
Textbook of Physiology (urine formation and reabsorption)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117266598（豆瓣书目条目: 生理学）
#肾小管 #重吸收 #肾糖阈
为什么阑尾不再被视为“完全无用的退化器官”，而被认为参与免疫？
Why is the appendix no longer seen as a useless vestige but as taking part in immunity?
阑尾富含肠道相关淋巴组织（GALT），是幼年免疫系统接触肠道抗原、训练淋巴细胞的场所，并可作为有益菌的“储备库”在腹泻后帮助重建菌群。进化上它与盲肠的发酵功能相关，并非纯遗留。当然它发炎（阑尾炎）仍需手术，并不因此否定其生理作用。
The appendix is packed with gut-associated lymphoid tissue (GALT), a site where the young immune system meets gut antigens and trains lymphocytes, and it can act as a “reservoir” of good bacteria to rebuild the microbiome after diarrhoea. Evolutionarily it links to caecal fermentation, not pure vestige. Inflamed (appendicitis), it still needs surgery—its physiology does not argue otherwise.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
曹雪涛《免疫学》第7版；《自然·免疫学评论》
Cao Xuetao "Immunology" 7th ed.; Nature Reviews Immunology
#阑尾 #肠道相关淋巴组织 #菌群 #免疫
"脚气"（足癣）是怎么得的？
How do people get athlete's foot (tinea pedis)?
足癣由皮肤癣菌引起，这类真菌以角蛋白为食，喜欢温暖潮湿的环境。赤脚在公共浴室、泳池边行走，或穿不透气的鞋袜，都会增加感染机会。抗真菌药能抑制真菌细胞膜中麦角固醇的合成，坚持按疗程用药一般可以治愈。
Athlete's foot is caused by dermatophyte fungi that feed on keratin and thrive in warm, damp places. Walking barefoot in public showers or pool areas, and wearing tight non-breathable shoes and socks, raise the risk. Antifungal creams work by blocking ergosterol synthesis in the fungal membrane, and finishing the full course usually cures the infection.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#足癣 #皮肤癣菌 #抗真菌药
炎症为什么表现为红、肿、热、痛？
Why does inflammation show up as redness, swelling, heat and pain?
损伤或感染处的免疫细胞释放组胺、前列腺素等介质：血管扩张带来更多血流，于是发红发热；血管通透性增加让血浆和白细胞渗入组织，造成肿胀；介质与肿胀压迫共同刺激痛觉神经，产生疼痛。这四个表现其实是免疫细胞"赶到现场"的副产物。
At the injured or infected site immune cells release histamine, prostaglandins and other mediators: vessels dilate, bringing more blood, so the area reddens and warms; vessels leak plasma and white cells into tissue, causing swelling; and mediators plus pressure excite pain nerves. The four classic signs are by-products of immune cells rushing to the scene.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#炎症 #免疫反应
抽一管血化验能查出哪些信息？
What can a blood test reveal?
血常规看红细胞、白细胞、血小板的数目，提示贫血、感染或凝血问题；生化检查测血糖、血脂、肝肾功能等指标，帮助筛查糖尿病和高脂血症。抽血化验是辅助诊断手段，医生会结合症状和影像综合判断。
A complete blood count looks at red cells, white cells, and platelets, hinting at anemia, infection, or clotting problems; a chemistry panel measures glucose, lipids, and liver or kidney markers to screen for diabetes and high cholesterol. Blood tests support but do not replace clinical judgment, which combines symptoms and imaging.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#血常规 #生化检查 #筛查
智能手表测心率、血氧、心电靠谱吗？
Are smartwatch heart rate, blood oxygen, and ECG readings reliable?
主流可穿戴设备用光电传感器和电极持续监测心率、血氧，部分还能记录单导联心电，对发现房颤等心律失常有一定提示作用，已有研究显示它能帮助识别平时不被发现的房颤。但这类设备是健康追踪工具而非医疗诊断设备，读数异常、出现不适症状时，还是应该到医院用标准仪器复核。
Mainstream wearables use optical sensors and electrodes to track heart rate and blood oxygen, and some record single-lead ECGs that can hint at arrhythmias like atrial fibrillation; studies show they can catch AF that would otherwise go unnoticed. But these are wellness trackers, not medical diagnostic devices—if a reading is abnormal or you have symptoms, verify it with standard instruments at a healthcare facility.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
FDA（可穿戴健康设备）
FDA (wearable health devices)
#可穿戴设备 #心率监测 #健康管理
止痛药怎么"知道"该止哪里的疼？
How does a painkiller "know" where the pain is?
它并不知道。布洛芬这类非甾体抗炎药随血液到达全身，但只在有炎症、前列腺素合成活跃的部位产生明显效果，所以"看起来"是精准作用。这也解释了它们的全身副作用（胃黏膜损伤、影响肾脏）。阿片类则作用于中枢受体，改变对疼痛的传导与感受。用药请遵循说明与医生建议。
It doesn't. NSAIDs like ibuprofen circulate everywhere but only produce a marked effect where inflammation and prostaglandin synthesis are active, so they appear targeted. That also explains their systemic side effects on stomach lining and kidneys. Opioids instead act on central receptors, changing pain transmission and perception. Follow label instructions and clinical advice.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#止痛药 #作用机制
肠道里的细菌对我们有什么好处？
How do the bacteria in our gut benefit us?
肠道菌群帮我们把膳食纤维分解成短链脂肪酸（如丁酸），为肠壁细胞供能并维持肠屏障；它们还能合成部分维生素（如维生素K）、训练免疫系统、抑制致病菌在肠道定植。饮食结构会明显改变菌群的组成和多样性，所以“吃什么”直接影响肠道健康。
Gut bacteria break down dietary fiber into short-chain fatty acids such as butyrate, which fuel gut cells and maintain the intestinal barrier. They also synthesize some vitamins, such as vitamin K, train the immune system, and crowd out harmful bacteria. Diet strongly shapes the composition and diversity of the microbiome, so what you eat directly affects gut health.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature Medicine（肠道菌群与健康）
Nature Medicine (gut microbiome and health)
#肠道菌群 #短链脂肪酸 #膳食纤维
肝脏在人体里主要负责什么？
What are the liver's main jobs in the body?
肝脏像一个多功能化工厂：它把食物中的营养转化为身体能利用的物质，合成凝血蛋白和白蛋白，把多余的葡萄糖储存为糖原，还负责分解药物和酒精等物质。肝细胞受损过多时，这些功能都会受影响，所以保护肝脏很重要。
The liver is a multifunctional chemical factory: it converts nutrients from food into usable forms, makes clotting proteins and albumin, stores surplus glucose as glycogen, and helps break down drugs and alcohol. If too many liver cells are damaged, all of these jobs suffer, which is why protecting the liver matters.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#肝脏 #代谢 #解毒
疼痛信号是怎么从伤口传到大脑的？
How does a pain signal travel from an injury to the brain?
组织受伤时释放的化学物质（如前列腺素、缓激肽、ATP）激活痛觉感受器，信号沿快传导的Aδ纤维和慢传导的C纤维进入脊髓，交换神经元后上行至丘脑，再分送到躯体感觉皮层（定位与强度）和前扣带皮层、岛叶（不适感与情绪）。这解释了为什么疼痛既有位置，也有"难受"的成分。
Injured tissue releases chemicals such as prostaglandins, bradykinin and ATP that activate nociceptors; signals travel via fast Aδ and slow C fibres into the spinal cord, relay to the thalamus, then split to somatosensory cortex (location and intensity) and to anterior cingulate and insula (unpleasantness and emotion). That is why pain has both a place and a felt awfulness.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#痛觉 #神经通路
为什么会痒？痒和痛是同一套系统吗？
Why do we itch, and is itch the same system as pain?
痒有部分独立的通路：皮肤中特定神经末梢被组胺、蛋白酶或Mrgpr受体激动剂激活后，经脊髓的"瘙痒专线"神经元上传。它与痛觉共享部分纤维，但由不同神经元亚群编码，这也解释了抗组胺药对某些痒有效、对痛无效。痒引发抓挠的反射在演化上有清除寄生虫与刺激物的意义。
Itch has partly dedicated circuitry: specific skin nerve endings respond to histamine, proteases or Mrgpr agonists, and signals ascend through itch-selective spinal neurons. It shares some fibres with pain but is coded by different neuron subsets, which is why antihistamines relieve some itches yet not pain. The scratch reflex likely evolved to remove parasites and irritants.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#瘙痒 #神经编码
X光为什么能拍出骨头？
Why can X-rays show bones?
X光是能穿透软组织的高能射线，但会被密度高、含钙的骨头更多地吸收。穿透过来的射线在探测器上形成明暗不同的图像：骨头挡住最多，显示为亮白色；肌肉和空气显示为灰色和黑色。
X-rays are high-energy radiation that passes through soft tissue but is absorbed more strongly by dense, calcium-rich bone. The rays that come through create a light-and-dark image: bone blocks the most and appears bright white, while muscle and air appear gray and black.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#X光 #骨密度 #成像
静脉里的血其实是暗红色的,为什么隔着皮肤看到的血管却泛着青蓝色?
Blood inside veins is actually dark red, so why do vessels seen through the skin look bluish?
其实静脉血是暗红色的,蓝色纯属视觉错觉。皮肤对短波长的蓝光散射强烈,使其只能停留在浅层,而长波长的红光穿透更深。红光进入组织后大多被血红蛋白吸收,自静脉所在位置返回得更少;蓝光虽然照不到血管,却在四周浅层大量反射回来。两相比较,血管处的红光明显缺失,大脑便把这片区域解读为青蓝色。
Veins never hold blue blood—their contents are simply dark red, and the bluish look is an illusion. Short-wavelength blue light is scattered by skin and stays near the surface, while longer-wavelength red light travels deeper, where hemoglobin—including that inside the vein—absorbs much of it. With far less red light coming back from where the vessel sits, the brain reads that region as bluish.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Kienle, Lilge, Vitkin, Patterson,《Why do veins appear blue? A new look at an old question》,Applied Optics,1996 (DOI: 10.1364/ao.35.001151)
Kienle, Lilge, Vitkin, Patterson, 'Why do veins appear blue? A new look at an old question', Applied Optics, 1996, DOI: 10.1364/ao.35.001151
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1364/ao.35.001151
#视错觉 #光散射 #静脉血
「牛皮癣」这个名字里带个癣字,它真是会传染的真菌感染吗?
Its folk name borrows the word for ringworm, so is psoriasis actually a contagious fungal infection?
不是。银屑病没有传染性,与真菌无关,本质是免疫系统驱动的慢性炎症性皮肤病。在遗传易感个体中,IL-23/Th17通路过度活跃,角质形成细胞的更新周期从约28天骤减到几天,大量未成熟细胞堆积于表皮,形成覆盖银白色鳞屑的红色斑块。因此抗真菌药完全无效,规范治疗依靠外用维生素D衍生物与糖皮质激素、光疗及生物制剂等免疫调节手段。
No. Psoriasis is not contagious and involves no fungus; it is fundamentally a chronic inflammatory skin disease driven by the immune system. In genetically susceptible individuals, overactive IL-23/Th17 signaling slashes the keratinocyte renewal cycle from about four weeks to a few days, so immature cells pile up in plaques covered with silvery scale. Antifungals are useless here; proper management relies on topical vitamin D derivatives and corticosteroids, phototherapy, and immune-modulating biologics.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Griffiths CEM等论文《Pathogenesis and Clinical Features of Psoriasis》,The Lancet,2007年
Griffiths CEM et al., Pathogenesis and Clinical Features of Psoriasis, The Lancet, 2007
独立核验依据 · Independent verification: 核验依据 1 EUROPEPMC 标识 17658397：Pathogenesis and clinical features
#银屑病 #自身免疫 #角质形成细胞
为什么伤口愈合时会觉得痒?新皮肤是怎么长出来的?
Why do healing wounds itch — how does new skin grow?
愈合时伤口边缘的新细胞不断增生,同时组胺等物质刺激神经末梢,加上新生血管和神经末梢敏感度高,痒感便产生了——痒恰恰说明修复在推进。千万别抓:指甲会撕开娇嫩的新组织。皮肤再生靠基底层细胞持续分裂,像砖墙从底层慢慢砌上来。
Healing edges multiply new cells while histamine and fresh nerve endings spark irritation — itching signals repair advancing. Never scratch; nails tear delicate new tissue. Skin regenerates as basal cells keep dividing like bricklayers building from below.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
韩启德总主编《十万个为什么》(第六版),少年儿童出版社,2013
Han Qide chief ed., Ten Thousand Whys, 6th edition, Juvenile and Children Publishing House, 2013, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#伤口愈合 #瘙痒 #皮肤再生
为什么我们打哈欠会传染?看到别人打哈欠自己也忍不住?
Why are yawns contagious — why can't I resist when others yawn?
传染性哈欠与共情相关:大脑的运动镜像系统看到别人打哈欠,会自动模拟同样的动作,这是社会动物同步行为的残留。约六到七成人会被传染,越亲近的朋友间传染率越高;自闭症谱系研究中传染性较弱也支持了共情假说。其原始功能可能是给群体提神醒脑。
Contagious yawning ties to empathy: the brain's mirroring system auto-copies seen actions, a leftover of synchronizing group behavior. Six to seven in ten people catch yawns, more between close friends; weaker contagion in autism studies supports the empathy link. Original purpose may have kept groups alert.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
韩启德总主编《十万个为什么》(第六版),少年儿童出版社,2013
Han Qide chief ed., Ten Thousand Whys, 6th edition, Juvenile and Children Publishing House, 2013, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#打哈欠 #镜像神经元 #共情
伤口为什么会结一层硬硬的痂？
Why does a cut form a hard scab?
流血时血液里的血小板和纤维蛋白像小网一样把伤口封住，血凝块在空气中变干变硬，就成了痂。它像一个临时的小盖子，挡住细菌，让下面的新皮肤安心长好。别去抠它，等新皮长好痂会自己掉。
When you bleed, platelets and fibrin in the blood weave a little net that seals the cut; the clot dries and hardens in the air into a scab. It works like a temporary lid that keeps germs out while new skin grows underneath. Don't pick it — it falls off by itself when the skin is ready.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#结痂 #凝血
为什么我们尝到的“味道”其实很大程度来自嗅觉？
Why does most of what we taste actually come from smell?
舌头只能分辨甜、咸、酸、苦、鲜五种基本味，而食物复杂香气由鼻腔中的嗅上皮识别，经“鼻后嗅觉”与味觉融合成整体风味。感冒鼻塞时饭菜“没味道”，正是嗅觉被阻断所致。这解释了为何捏鼻尝东西时很难区分苹果和洋葱。
The tongue senses only five basics—sweet, salty, sour, bitter, umami—while a food's complex aroma is read by the nasal epithelium and fused with taste via “retronasal smell” into flavour. With a cold and blocked nose food “tastes of nothing” because smell is cut. That is why, pinching the nose, apple and onion are hard to tell apart.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
朱大年《生理学》第9版；中国营养学会
Zhu Danian "Physiology" 9th ed.; Chinese Nutrition Society
#味觉 #嗅觉 #鼻后嗅觉 #风味
为什么抓痒的时候会觉得很爽？
Why does scratching an itch feel so good?
抓挠制造了轻微的疼痛和触觉刺激，能在脊髓水平暂时压住痒的信号，同时大脑的奖赏区域被激活，于是产生舒服感。可惜这只是短暂的：抓破皮肤会释放更多致痒物质，形成"越抓越痒"的循环，所以冷敷或保湿常比抓更管用。
Scratching creates mild pain and touch signals that briefly suppress itch signals in the spinal cord, while reward areas of the brain light up — hence the pleasure. Unfortunately it is short-lived: broken skin releases more itch-producing substances, creating an itch–scratch cycle, so cooling or moisturising often works better than scratching.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#抓挠 #痒抓循环
冷的时候为什么会起鸡皮疙瘩？
Why do we get goose bumps when we're cold?
每根毛发根部都有一小块肌肉，遇冷或紧张时它会收缩，把毛立起来，皮肤就冒出小疙瘩。对毛发浓密的动物来说，立起的毛能留住一层暖空气；人类毛少，这个动作留下的更多是可爱的小鸡皮。
Each hair has a tiny muscle at its root; when you are cold or startled it contracts, standing the hair up and raising little bumps on the skin. In furry animals raised hair traps a warm layer of air; humans have little fur, so mostly we just get the bumps.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#鸡皮疙瘩 #立毛肌
为什么打完疫苗手臂会酸痛、有时还发低烧？
Why does your arm ache and you sometimes run a mild fever after a vaccine?
这是免疫系统被正常激活的表现：注射部位的免疫细胞聚集并释放炎症介质，引起局部酸胀红肿；细胞因子进入循环后可引起低烧、乏力和肌肉酸痛。这些反应通常1—3天消退，并不代表"生病"，也不能据此判断疫苗是否有效。持续加重或出现异常症状应就医。
It reflects normal immune activation: immune cells gather at the injection site and release inflammatory mediators, causing local ache and swelling, while cytokines entering the circulation can bring mild fever, fatigue and muscle aches. These usually settle in one to three days, do not mean you are ill, and do not indicate how well the vaccine worked. Worsening or unusual symptoms should be checked.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#疫苗反应 #免疫激活
为什么天冷时鼻子会流个不停？
Why does your nose run in cold weather?
鼻腔需要把吸入空气加温加湿，冷空气刺激会使黏膜血流增加、腺体分泌更多液体；同时呼出的湿热空气在鼻腔前部遇冷凝结成水滴。两者叠加就出现"清水样鼻涕"。这是正常生理反应，与感染性鼻炎的黄绿色浓稠分泌物不同。
The nose must warm and humidify incoming air, so cold air boosts mucosal blood flow and glandular secretion; meanwhile warm moist exhaled air condenses into droplets in the chilly front of the nose. Together they produce a clear, watery drip. This is normal physiology, unlike the thick yellow-green discharge of an infection.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#鼻腔 #冷空气反应
为什么有的伤会留疤？
Why do some wounds leave scars?
皮肤深层（真皮）受损时，身体来不及重建原有的规则结构，只能用快速铺设的胶原纤维"补上"，这些纤维排列杂乱、缺少毛囊和汗腺，因此形成疤。伤口越深、张力越大、感染或反复受伤越多，疤越明显。保持清洁湿润、减少张力和防晒有助于减轻疤痕。
When the deeper dermis is damaged, the body cannot rebuild its original ordered architecture in time and patches the gap with rapidly laid collagen that is disorganised and lacks hair follicles and sweat glands — that is a scar. Deeper wounds, higher tension, infection and repeated injury make scars more obvious. Keeping wounds clean and moist, reducing tension and using sun protection help minimise them.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
王庭槐 主编,《生理学》第9版,人民卫生出版社,2018
Wang Tinghuai ed., Physiology, 9th ed., People's Medical Publishing House, 2018
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787117266598（豆瓣书目条目: 生理学）
#疤痕 #胶原
伤口结痂愈合的阶段,为什么常常痒得让人忍不住想挠?
Why do cuts and scrapes often itch badly while the scab is healing?
这种痒是修复过程自身的信号,主要来自组胺释放和新神经末梢受刺激。愈合期间肥大细胞释放组胺,既推动炎症与血管新生,也是瘙痒的关键信使;同时新生的神经纤维在瘢痕组织中无序生长,对轻微牵拉非常敏感,结痂收缩与胶原沉积带来的紧绷感又持续激活感受器,痒意便一阵阵袭来。此时抓挠容易撕开新生组织,冷敷或涂抹保湿剂更安全。
That itch is generated by the repair process itself, chiefly through histamine release and irritated newborn nerve endings. While a wound heals, mast-cell histamine drives inflammation and new vessel growth yet doubles as the core itch signal; meanwhile young nerve fibers sprouting through scar tissue fire at the slightest pull, and the tightness from scab contraction and collagen deposition keeps triggering receptors. Scratching risks ripping fresh tissue, so cool compresses or moisturizer are safer choices.
难度 入门 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Rook's Textbook of Dermatology(第9版),Griffiths C等主编,Wiley-Blackwell,2016年
Rook's Textbook of Dermatology, 9th edition, edited by Christopher Griffiths et al., Wiley-Blackwell, 2016
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL21119860W：Rook's Textbook of Der
#伤口愈合 #组胺 #瘙痒
为什么我们有两只眼睛,而不是一只大眼睛?
Why do we have two eyes instead of one big one?
两只眼睛从不同角度看世界,大脑把两个画面合成一个立体的——这样你才能判断皮球离你多远、楼梯有多高。试试闭上一只眼去接球,会发现特别难接。两只眼睛还是备份:一只累了或受伤了,另一只还能继续工作。
Your two eyes see from different angles and your brain merges them into one 3D picture — that is how you judge how far the ball is or how tall the step. Close one eye to catch a ball and it gets surprisingly hard. Two eyes are also backups for each other.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
韩启德总主编《十万个为什么》(第六版),少年儿童出版社,2013
Han Qide chief ed., Ten Thousand Whys, 6th edition, Juvenile and Children Publishing House, 2013, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#双眼视觉 #立体感 #大脑
跑步的时候为什么心跳得咚咚快?心脏一直在工作不累吗?
Why does my heart thump when I run? Does it ever get tired?
跑步时肌肉需要更多氧气,心脏就像水泵加速工作,把含氧血液更快送到全身,所以你听见咚咚声。心脏是超级劳模:从出生前就开始跳,一天约十万次,但它每次跳动之间都有短暂休息,而且越锻炼越强壮。
Running muscles need extra oxygen, so your heart pumps faster to deliver it — that is the thump. The heart is a super worker: beating about a hundred thousand times a day since before you were born, with tiny rests between beats, growing stronger the more you exercise.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
韩启德总主编《十万个为什么》(第六版),少年儿童出版社,2013
Han Qide chief ed., Ten Thousand Whys, 6th edition, Juvenile and Children Publishing House, 2013, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#心脏 #血液循环 #锻炼
为什么手指泡水久了会起皱褶?像小梅子一样
Why do fingertips wrinkle like little prunes after a long bath?
这不是皮肤「吸水变大」,而是神经系统主动让指尖血管收缩、皮肤皱起来——形成像轮胎花纹一样的排水槽,让你在湿滑的地方抓得更牢。实验证明皱褶的手指拿湿弹珠比平滑的手指快得多。这是身体自带的防滑装备!
Wrinkly fingers are not swelling — your nervous system shrinks blood vessels to fold the skin into tire-tread channels that drain water away, gripping wet things better. Experiments show wrinkled fingers pick up wet marbles much faster. It is built-in anti-slip gear.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Henderson S, Hooper AT, Rennie C, Nieuwland M, Smith AT. Why our fingers wrinkle in the bath. Scientific Reports, 2016, 6:19167
Henderson S, Hooper AT, Rennie C, Nieuwland M, Smith AT. Why our fingers wrinkle in the bath. Scientific Reports, 2016, 6:19167
独立核验依据 · Independent verification: 核验依据 1 DOI 10.64628/ab.rj9ftq6q5
#皮肤皱褶 #神经 #防滑