Which of the following is the order of events that prompts release of neurotransmitters into the synapse?
A. An action potential reaches the axon terminals, vesicles fuse with cell membrane, calcium ions enter the terminals, vesicles fuse with cell membrane, neurotransmitter is released.
B. Calcium ions enter the terminals, an action potential reaches the axon terminals, vesicles fuse with cell membrane, neurotransmitter is released.
C. Vesicles fuse with cell membrane, an action potential reaches the axon terminals, calcium ions enter the terminals, neurotransmitter is released.
D. An action potential reaches the axon terminals, calcium ions enter the terminals, vesicles fuse with cell membrane, neurotransmitter is released.
Answer: D
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