For a cardiac cell to return to its resting membrane potential,
A) repolarization of the cell membrane must occur.
B) a nerve impulse must be initiated by the Purkinje fibers.
C) depolarization of the cardiac cell membrane must occur.
D) None of the above are correct.

Question

Quizplus · Accepted Answer

Depolarization and repolarization are part of the action potential that allows the cardiac cell to contract and pump blood. However, to return to its resting membrane potential, repolarization of the cell membrane must occur. The initiation of a nerve impulse by Purkinje fibers is not necessary for the restoration of the resting membrane potential.

For a Cardiac Cell to Return to Its Resting Membrane