Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then ________.
A) no action potential will be initiated
B) an action potential will be initiated and proceed only in the normal direction toward the axon terminal
C) an action potential will be initiated and proceed only back toward the axon hillock
D) two action potentials will be initiated, one going toward the axon terminal and one going back toward the hillock

Question

Quizplus · Accepted Answer

Depolarizing the middle of the axon to threshold will initiate action potentials in both directions: toward the axon terminal and back toward the axon hillock, as there is no refractory period preventing backward propagation.

Action Potentials Are Normally Carried in Only One Direction: from the Axon