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.