nervous Medicine & Health

5 个科学问题 · 医学健康 Medicine & Health

本页目录

什么是反射?为什么眨眼睛是反射?

What are reflexes, and why is blinking a reflex?

反射是不经过大脑思考的快速、固定反应,由脊髓等低级中枢完成;眨眼睛是保护眼睛免受异物和强光的防御反射。
A reflex is a fast, fixed response that bypasses the brain, handled by the spinal cord; blinking is a protective reflex shielding the eye from objects and bright light.
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

#反射 #脊髓

为什么触摸到烫的东西会立刻缩手?

Why do we pull our hand away from something hot?

碰到烫的东西,感觉神经立刻把信号经脊髓传到肌肉,几乎瞬间让手缩回,这种反射能在大脑感到痛之前保护你。
Touching something hot, sensory nerves send a signal via the spinal cord to muscles, pulling the hand back almost instantly; this reflex protects you before the brain feels pain.
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

#痛觉 #反射

为什么摔跤或转圈后会感到头晕?

Why do we feel dizzy after spinning?

快速转圈后停下,耳内负责平衡的前庭系统还在"转",传给大脑的信息和眼睛看到的不一致,就会感到头晕。
After spinning, the inner-ear balance system still signals motion, conflicting with what the eyes see, making you feel dizzy.
难度 进阶 · 适合 小学高段(9-12) 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

#前庭 #平衡

为什么会感到疼痛?

Why do we feel pain?

疼痛是身体发出的"警报",提醒我们哪里受伤或生病了,好让我们去保护它。
Pain is the body's alarm that tells you where you are hurt or sick, so you can protect that part.
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

#疼痛 #感觉

大脑一天消耗多少能量?

How much energy does the brain consume per day?

大脑虽然只占体重约2%,却要消耗全身约20%的能量,主要用来维持神经活动和思考。
Though only about 2% of body weight, the brain uses about 20% of the body's energy, mainly to keep nerves active and support thinking.
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

#大脑 #能量