Opening of what channels is responsible for the depolarization phase of the cardiac contractile cell action potential?
A) potassium channels
B) T -type calcium channels
C) funny channels
D) L -type calcium channels
E) voltage -gated sodium channels

Question

Quizplus · Accepted Answer

The depolarization phase of the cardiac contractile cell action potential is primarily due to the opening of voltage-gated sodium channels, which allows sodium ions to rush into the cell, causing the membrane potential to become more positive.

Opening of What Channels Is Responsible for the Depolarization Phase