When an action potential reaches the presynaptic terminal of a neuron, the NEXT event is

A) uptake of neurotransmitter from the synaptic cleft.
B) active transport of calcium ions out of the cell.
C) diffusion of calcium ions into the cell.
D) immediate release of neurotransmitter.


Answer: C) diffusion of calcium ions into the cell.

Anatomy & Physiology

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