What ensures the one-way direction of an action potential?
A. Conduction of an action potential is an all-or-none event.
B. An axon can conduct a volley of action potentials very quickly.
C. Action potentials are self-propagating.
D. An action potential at one node causes an action potential at the next node.
E. As soon as the action potential has passed by, that portion of the axon undergoes a short refractory period.
Answer: E
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