When an action potential arrives at an axon terminal, it causes the opening of _______ channels, increasing the concentration of this ion within the cell, which ultimately triggers fusion of neurotransmitter vesicles with the cell membrane.
A) acetylcholine
B) sodium
C) potassium
D) calcium
E) chloride

Question

Quizplus · Accepted Answer

When an action potential reaches the axon terminal, voltage-gated calcium channels open, allowing an influx of calcium ions into the cell. The increased concentration of calcium triggers the fusion of neurotransmitter vesicles with the cell membrane, leading to the release of neurotransmitters into the synaptic cleft.

When an Action Potential Arrives at an Axon Terminal, It