When sodium channels are fully open, the membrane of the ventricular cardiac muscle cells ________.
A) sharply hyperpolarizes
B) sharply repolarizes
C) sharply depolarizes
D) plateaus
E) has no response

Question

Quizplus · Accepted Answer

When sodium channels are fully open, the membrane of the ventricular cardiac muscle cells sharply depolarizes. This is because the opening of sodium channels allows Na+ ions to rush into the cell, causing the membrane potential to become more positive.

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