In a synapse, what initiates the release of neurotransmitter?
A) when an action potential depolarizes the presynaptic membrane
B) when threshold potential is reached
C) when enough voltage-gated sodium channels open to release calcium into the synapse
D) the presence of gap junctions joining the synaptic membranes

Question

Quizplus · Accepted Answer

The release of neurotransmitter is initiated when an action potential depolarizes the presynaptic membrane. This depolarization opens voltage-gated calcium channels, which allows calcium ions to enter the axon terminal and trigger the release of neurotransmitter into the synapse.

In a Synapse, What Initiates the Release of Neurotransmitter