An action potential is propagated down an unmyelinated neuron plasma membrane because
a. the action potential stimulates voltage-gated Na+ channels adjacent to it.
b. the action potential stimulates voltage-gated Ca2+ channels adjacent to it.
c. the action potential stimulates voltage-gated K+ channels adjacent to it.
d. the action potential stimulates voltage-gated Na+ and Ca2+ channels adjacent to it.
e. the action potential stimulates voltage-gated k+ and Ca2+ channels adjacent to it.
D
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