A key causal event in the release of neurotransmitter molecules from vesicles into the synaptic cleft is the:

The options are not given, here are the options.

A. efflux of calcium ions at the axon hillock

b) influx of sodium ions in response to the arrival of an action potential at the terminal.

c) influx of calcium ions in response to the arrival of an action potential at the terminal.

d) influx of chloride ions at the axon hillock

The correct option is C.

influx of calcium ions in response to the arrival of an action potential at the terminal.

Explanation:

A key causal event in the release of neurotransmitter molecules from vesicles into the synaptic cleft is the influx of calcium ions in response to the arrival of an action potential at the terminal and this is because the nerve impulses at presynaptic axon terminal during action potential cause influx calcium to presynaptic axon and causes the release of neurotransmitters into the synaptic cleft. After it is released,it binds and cause activation of receptor inside the postsynaptic membrane and this lead to regeneration of the action potential present in postsynaptic neuron.

It is very important for deactivation of neurotransmitter very quickly so as to be able to differentiate one signal from the other.

the match lol