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当神经冲动到达运动神经末梢时,可引起接头前膜()

单选题
2023-03-06 12:18
A、钠离子通道关闭
B、钙离子通道开放
C、钾离子通道关闭
D、氯离子通道开放
E、钾离子通道开放
查看答案

正确答案
B

试题解析
神经冲运到达运动神经末梢时,接头前膜去极化,引起该处电压门控钙离子通道开放,导致钙离子迅速进入末梢,触发前膜ACh囊泡释放。

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