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

All cardiac cell membranes are positively charged on their outer surfaces.When the cell is stimulated,movement of ions in and out of the membrane alters its charge,reversing the resting potential.This period is referred to as depolarization.Reversal of ion flow reestablishes a positive charge to the outside of the membrane,a process called repolarization,which returns the membrane to its resting membrane potential.

For a Cardiac Cell to Return to Its Resting Membrane