What Activity Is Occurring in the Heart During the Q-T

Multiple Choice

What activity is occurring in the heart during the Q-T interval on an electrocardiogram (ECG) ?

A) The atrial cells are undergoing action potentials.
B) The ventricular cells are repolarizing.
C) The ventricular cells are undergoing action potentials.
D) The AV node delay occurs as the action potential spreads from the SA node to the atria to the ventricles.