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

Question

Quizplus · Accepted Answer

When an action potential arrives at an axon terminal, it causes the opening of calcium channels, which triggers the fusion of neurotransmitter vesicles with the cell membrane. This allows the release of neurotransmitters into the synaptic cleft for communication with the next neuron or target cell. Sodium, potassium, chloride, and acetylcholine do not directly trigger this process.

When an Action Potential Arrives at an Axon Terminal, It