Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?
A. Presynaptic terminals have no acetylcholine receptors.
B. Synaptic vesicles in the postsynaptic membrane are inactive.
C. Acetylcholine is destroyed too quickly.
D. Presynaptic neurons do not have a resting membrane potential.
E. Acetylcholine can only diffuse in one direction across the synaptic cleft.
Answer: A
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