本题目来源于试卷: Interaction & Interdependence C.5 Neural Signaling，类别为 IB生物学
[单选题]
Which triggers the release of neurotrans4a q5d e,ak)lrmi /u:leq-y/hk2r(ia++maraiyyf x o 2uh ;:f 6etters from the presynaptic membrane?
A. Depolarisation of the presynaptic membrane
B. A refractory period after depolarisation of the presynaptic membrane
C. Repolarisation of the presynaptic membrane
D. Activation of receptors on the postsynaptic neuron
参考答案: A
本题详细解析:
Explanation: Depolarisation triggers the influx of calcium ions into the presynaptic knob, which brings about the release of neurotransmitters from the presynaptic membrane, Choice A is correct. Choices B and C are incorrect, as neither depolarisation nor repolarisation can occur during the refractory period. Choice D is incorrect as activation of receptors on the postsynaptic membrane is caused by neurotransmitter binding; it does not trigger their release.
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