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【单选题】
关于兴奋性突触传递的叙述,下列哪一项是错误的( )
A.
突触前轴突末梢去极化
B.
Ca2+由膜外进入突触前膜内
C.
突触小泡释放,并与突触后膜受体结合
D.
突触后膜对Na+、K+、Ca2+,尤其是K+通透性增高
E.
突触后膜电位去极化达到阈值时,引进突触后神经元发放冲动
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