Question 14
Choose the best answer
What happens after an action potential reaches the axon terminal?

A. The impulse changes its charge in the synapse
B Vesicles release neurotransmitters into the synapse.
C
Na+ and K+ ions rush into the synapse
D Neurotransmitters are broken down in the synapse

is A.

Explanation:

When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated Na+ channels. Na+ ions enter the cell, further depolarizing the presynaptic membrane. ... Fusion of a vesicle with the presynaptic membrane causes neurotransmitters to be released into the synaptic cleft.

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