An action potential begins in a myocardial cell when ________ enters the cell, giving it a ________ charge.
A) calcium; positive
B) sodium; positive
C) sodium; negative
D) calcium; negative

Question

Quizplus · Accepted Answer

An action potential begins in a myocardial (cardiac muscle) cell when sodium enters the cell, giving it a positive charge. This is known as depolarization and is the first step in the process by which the heart contracts to pump blood.

An Action Potential Begins in a Myocardial Cell When ________