When an action potential reaches the presynaptic terminal,
A. acetylcholine moves into the presynaptic terminal.
B. ligand-gated ion channels in the presynaptic terminal are opened.
C. nothing else happens.
D. a local potential is generated in the presynaptic terminal.
E. calcium ions diffuse into the presynaptic terminal through voltage-gated ion channels.
Answer: E
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