Which is the incorrect pairing between phase of the action potential of ventricular muscle fibers and event that occurs within the phase? A) Rising phase: opening of voltage-gated Na⁺ channels B) Falling phase: closing of K⁺ channels C) Plateau phase: prolonged opening of voltage-gated Ca²⁺ channels D) Falling phase: closure of Ca²⁺ channels E) Rising phase: closure of K⁺ channels

Question

Quizplus · Accepted Answer

In the falling phase of the action potential of ventricular muscle fibers, potassium channels (K^+ channels) actually open, not close, to allow K^+ to exit the cell, which helps in repolarizing the cell back to its resting membrane potential.

Which Is the Incorrect Pairing Between Phase of the Action