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

Anatomy & Physiology

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