大学MOOC 生理学(东南大学)1461714161 最新慕课完整章节测试答案

Resting potential

1、单选题：
‏Inactive muscle and nerve cells maintain a resting membrane potential. This potential results in:‎‏‎
选项：
A: The outside of the cell being negative
B: The inside of the cell being positive
C: The inside and outside of the cell having the same charge
D: The inside of the cell being neg
答案: 【 The inside of the cell being neg】

2、判断题：
‌Decreasing a neuron’s intracellular fluid [K+] by 1 mM have the same effect on resting membrane potential as raising the extracellular fluid [K+] by 1 mM.‌‌‌
选项：
A: 正确
B: 错误
答案: 【 错误】

动作电位的产生机制

1、单选题：
‏某肌细胞膜电位由静息状态下的-70mV变为-20mV时称为（）‎‏‎
选项：
A: 极化
B: 去极化
C: 超极化
D: 反极化
答案: 【 去极化】

2、单选题：
‏细胞外液中Na+浓度降低的话，细胞受到有效刺激后所爆发的动作电位的幅度将 （）‍
选项：
A: 增高
B: 降低
C: 不变
D: 先增高后降低
答案: 【 降低】

3、单选题：
‎Cell membranes can maintain a difference in electrical charge between the interior of the cell and the extracellular fluid. What is this charge difference called?‌
选项：
A: Excitability
B: The membrane potential
C: The action potential
D: The sodium-potassium pump
答案: 【 The membrane potential】

4、单选题：
‍Which of the following describes an “action potential”?‎
选项：
A: The high concentration of Na+ and Cl− outside the cell and of K+ inside the cell
B: The voltage change that moves along the cell membrane until it reaches the axon hillock
C: The movement of a neurotransmitter from the presynaptic membrane to the postsynaptic membrane
D:  The movement of Na+ across the cell membrane into the cell, followed by the movement of K+ out of the cell
答案: 【  The movement of Na+ across the cell membrane into the cell, followed by the movement of K+ out of the cell】

动作电位的触发和在一个细胞上的传播

1、单选题：
‍What event during the action potential c