突触如何通过化学方式传递信息？
How does a synapse transmit information chemically?
动作电位抵达突触前膜，触发钙离子内流、释放神经递质到突触间隙，递质结合后膜受体，把信号转为电信号继续传播。
An action potential reaches the presynaptic terminal, triggering calcium influx and release of neurotransmitters into the gap; they bind postsynaptic receptors, converting the signal back to electrical flow.
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
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#突触 #神经递质 #钙离子
血脑屏障有什么作用？
What is the function of the blood-brain barrier?
脑毛细血管内皮紧密连接形成屏障，阻挡大多数大分子与病原体进入脑组织，保护大脑稳态，但也让许多药物难以进入。
Tight junctions in brain capillaries form a barrier blocking most large molecules and pathogens from the brain, protecting its environment—but also keeping many drugs 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
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#血脑屏障 #脑 #稳态
髓鞘怎样让神经信号传得更快？
How does myelin make nerve signals travel faster?
髓鞘是包裹轴突的脂质绝缘层，迫使动作电位在郎飞结间“跳跃”传导（跳跃传导），速度远快于无髓纤维，也节能。
Myelin is a fatty insulation around axons that forces the action potential to 'jump' between nodes of Ranvier (saltatory conduction), far faster and more efficient than unmyelinated conduction.
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
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#髓鞘 #跳跃传导 #轴突
神经元是怎样传递信号的？
How do neurons transmit signals?
神经元在静息时膜内外有电位差；受刺激时钠离子内流产生动作电位，沿轴突传导，到末梢释放神经递质传给下一个细胞。
At rest a neuron has a voltage across its membrane; a stimulus lets sodium rush in, creating an action potential that travels the axon and releases neurotransmitters to the next cell.
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
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#神经元 #动作电位 #神经