Why Do Action Potentials Only Travel Down the Axon and Not

Multiple Choice

Why do action potentials only travel down the axon and not the other direction?

A) An area where an action potential just occurred is still in a refractory period.
B) Resting potentials change with direction of the nerve impulse.
C) Sodium-potassium pumps only act in one direction.
D) Actions potential do not cause depolarization.