What causes depolarization of a cardiac muscle cell to occur?
A) Decrease in the permeability of the cell membrane to potassium
B) Rapid movement of sodium into the cell
C) Decrease in the movement of sodium out of the cell
D) Rapid movement of calcium out of the cell

Question

Quizplus · Accepted Answer

Phase 0 consists of depolarization,which lasts 1 to 2 milliseconds (ms)and represents rapid sodium entry into the cell.This selection is the only option that accurately describes the cause of cardiac muscle cell depolarization.

What Causes Depolarization of a Cardiac Muscle Cell to Occur