When sodium channels are fully open,the membrane of the ventricular cardiomyocyte _________.
A) sharply hyperpolarizes
B) sharply repolarizes
C) sharply depolarizes
D) plateaus
E) has no reponse

Question

Quizplus · Accepted Answer

When sodium channels are fully open in a ventricular cardiomyocyte, the membrane sharply depolarizes. This is because sodium ions rush into the cell, causing a sudden change in the electrical potential across the cell membrane. This depolarization is an important step in the action potential of cardiac muscle cells, leading to the contraction of the heart.

When Sodium Channels Are Fully Open,the Membrane of the Ventricular