The plateau phase seen during the action potential of a cardiac muscle cell is due to the A) sodium-potassium pump. B) opening of Na⁺ channels. C) continuing to have open Ca²⁺channels. D) closure of Cl⁻ channels. E) closing of Ca²⁺ channels.

Question

Quizplus · Accepted Answer

The plateau phase of a cardiac muscle cell's action potential is primarily due to the opening of calcium channels, which allows Ca2+ ions to enter the cell, maintaining depolarization for a longer period.

The Plateau Phase Seen During the Action Potential of a Cardiac