Arrival of an action potential at the synaptic knob results in
A. closure of voltage-gated calcium channels in the synaptic knob membrane.
B. opening of voltage-gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid.
C. opening of voltage-gated calcium channels and diffusion of calcium into the synaptic knob.
D. opening of chemically gated calcium channels and diffusion of calcium into the synaptic knob.
E. opening of chemically gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid.
Answer: C
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