兴奋在神经元细胞间的传递是通过突触来实现的。下列对于递质的错

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兴奋在神经元细胞间的传递是通过突触来实现的。下列对于递质的错误叙述是（）

A．递质传递是单向的

B．递质通过主动运输进入突触后膜

C．递质使突触后膜兴奋时，兴奋处膜外为负电位

D．递质只能通过突触前膜释放到突触间隙，作用于突触后膜

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