In an ECG,the QRS complex represents
A)depolarization of the atria.
B)depolarization of the ventricles.
C)repolarization of the atria.
D)repolarization of the ventricles.

Question

Quizplus · Accepted Answer

The QRS complex represents depolarization of the ventricles. The atria have already depolarized during the P wave, and repolarize during the QRS complex. The ventricles depolarize during the QRS complex, leading to their contraction and subsequent ejection of blood into the arteries.

In an ECG,the QRS Complex Represents