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触发突触小泡出胞的是()

单选题
2021-12-30 23:18
A、Na
B、Na
C、K
D、K
E、Ca
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正确答案
E

试题解析
当细胞受到阈刺激时,引起Na内流,去极化达阈电位水平时,Na通道大量开放,Na迅速内流的再生循环,造成快速去极化,使膜内正电位迅速升高,形成上升支;当动作电位传到运动神经末梢,接头前膜去极化,电压门控Ca通道开放,Ca内流,末梢内Ca浓度升高触发突触小泡的出胞机制。

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