When an Action Potential Reaches the Presynaptic Membrane, It Causes

Multiple Choice

When an action potential reaches the presynaptic membrane, it causes the opening of certain voltage-gated ion channels that permit the influx of specific ions, which causes synaptic vesicles to fuse with the presynaptic membrane and release their neurotransmitter substances via exocytosis into the synaptic cleft. These voltage-gated ion channels permit the

A) influx of Na⁺
B) outflow of K⁺
C) influx of Cl^-
D) influx of Ca²⁺
E) outflow of Cl^-