If a stimulating electrode is placed in the middle of a resting axon and an above-threshold voltage is applied to the electrode action potentials
A) will not occur.
B) will start at that point and proceed only toward the axon terminal.
C) will start at that point and proceed only toward the cell body.
D) will start at that point and travel in both directions in the axon.

Question

Quizplus · Accepted Answer

When a stimulating electrode is placed in the middle of a resting axon and an above-threshold voltage is applied to the electrode, action potentials will start at that point and travel in both directions in the axon. This is because the voltage change generated by the applied current can depolarize the axon membrane in both directions from the electrode, leading to propagation of the action potential in both directions. However, the amplitude of the action potential will be larger in the direction of propagation toward the axon terminal because the axon terminals have a higher density of voltage-gated ion channels, which can amplify the signal.

If a Stimulating Electrode Is Placed in the Middle of a Resting