When an action potential arrives at the presynaptic terminal:
A. Voltage-gated calcium channels are activated.
B. Intracellular calcium stores are released.
C. Synaptic vesicles fuse to the membrane of the soma.
D. Calcium is actively transported out of the neuron terminal.
E. A, B, and D
ANS: B
Rationale: Arrival of an action potential at the presynaptic terminal triggers the opening of voltage-gated calcium channels. This results in an influx of calcium into the neuron terminal and triggers the movement of synaptic vesicles toward release sites. The synaptic vesicles fuse with the presynaptic membrane and release neurotransmitters into the synaptic cleft.
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