What event(s) occur during the QRS complex of an electrocardiogram?

A) Depolarization of the atria
B) Repolarization of the ventricles
C) Depolarization of the atria and repolarization of the ventricles
D) Depolarization of the ventricles and repolarization of the atria

QRS Complex

A series of three deflections in an electrocardiogram (ECG) representing the depolarization of the heart's ventricles before contraction.

Electrocardiogram

An Electrocardiogram (ECG) is a test that records the electrical activity of the heart to detect heart problems and monitor the heart's status.

Depolarization

The process by which a cell's resting membrane potential becomes less negative, leading to an action potential and potentially initiating a nerve impulse.