The QRS complex on a typical ECG represents
A) depolarization of atrial muscle.
B) depolarization of ventricular muscle.
C) repolarization of ventricular muscle.
D) repolarization of atrial muscle.

Question

Quizplus · Accepted Answer

The QRS complex represents the depolarization of ventricular muscle, which leads to the contraction of the ventricles and the ejection of blood from the heart. The depolarization of atrial muscle is represented by the P wave, and the repolarization of ventricular muscle is represented by the T wave. Repolarization of atrial muscle is not typically visible on the ECG.

The QRS Complex on a Typical ECG Represents