为什么肠道常被称为“第二大脑”？
Why is the gut often called a second brain?
肠道拥有约5亿个神经元和庞大的肠神经系统，能独立调控消化，并通过迷走神经与脑双向沟通，影响情绪与免疫。
The gut has about 500 million neurons and its own enteric nervous system that controls digestion and communicates bidirectionally with the brain via the vagus nerve, influencing mood and immunity.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）肠神经系统章节
Guyton and Hall, Textbook of Medical Physiology (enteric nervous system chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#肠道 #肠脑轴
自主神经系统如何调节非随意功能？
How does the autonomic nervous system regulate involuntary functions?
自主神经系统由交感与副交感两部分组成，分别应对“战斗或逃跑”和“休息与消化”，通过神经递质动态调节心率、血压和消化等。
The autonomic nervous system has sympathetic and parasympathetic branches that balance fight-or-flight and rest-and-digest, regulating heart rate, blood pressure, and digestion via neurotransmitters.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）自主神经系统章节
Guyton and Hall, Textbook of Medical Physiology (autonomic nervous system chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#神经系统 #自主神经
血脑屏障是如何工作的？
How does the blood-brain barrier work?
血脑屏障由紧密连接的脑毛细血管内皮细胞构成，能选择性阻挡大多数大分子与病原体，同时允许氧气与葡萄糖等必需物质通过。
The blood-brain barrier is formed by tightly joined capillary endothelial cells that selectively block most large molecules and pathogens while allowing essentials like oxygen and glucose through.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Kandel 等《神经科学原理》（Principles of Neural Science）血脑屏障章节
Kandel et al., Principles of Neural Science (blood-brain barrier chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787111430810（豆瓣书目条目: 神经科学原理）
#血脑屏障 #神经
肺是如何完成气体交换的？
How do the lungs carry out gas exchange?
肺泡壁极薄且布满毛细血管，氧气通过扩散从肺泡进入血液，二氧化碳则从血液进入肺泡后被呼出。
Alveoli have very thin walls surrounded by capillaries; oxygen diffuses from the alveoli into the blood while carbon dioxide diffuses out to be exhaled.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）呼吸生理章节
Guyton and Hall, Textbook of Medical Physiology (respiratory physiology chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#呼吸系统 #肺泡
肝脏在身体里主要负责什么？
What is the main role of the liver?
肝脏负责代谢营养物质、合成蛋白质、储存糖原并解毒，是人体内功能最多的器官之一。
The liver metabolizes nutrients, makes proteins, stores glycogen, and detoxifies—one of the body's most versatile organs.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）肝脏生理章节
Guyton and Hall, Textbook of Medical Physiology (liver physiology chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#肝脏 #代谢
颅骨是如何保护大脑的？
How does the skull protect the brain?
颅骨由多块坚硬骨头拼合而成，外层的硬脑膜与脑脊液形成缓冲层，能吸收撞击、减少脑部损伤。
The skull is made of fused hard bones, and the meninges plus cerebrospinal fluid cushion the brain, absorbing shocks to reduce injury.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Standring《格氏解剖学》（Gray's Anatomy）神经解剖学章节
Standring, Gray's Anatomy: The Anatomical Basis of Clinical Practice (neuroanatomy chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7020-5230-9 (Elsevier)
#大脑 #颅骨
骨头有什么用？
What are bones for?
骨头像身体的支架，保护大脑和心脏，还能帮我们站立和走路。
Bones are like the body's frame; they protect your brain and heart and help you stand and walk.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Standring《格氏解剖学》（Gray's Anatomy: The Anatomical Basis of Clinical Practice）骨骼系统章节
Standring, Gray's Anatomy: The Anatomical Basis of Clinical Practice (skeletal system chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7020-5230-9 (Elsevier)
#骨骼 #身体