In a normal electrocardiogram (ECG or EKG),
A) the P wave results from repolarization of the atria.
B) the QRS complex results from depolarization of the ventricles.
C) the T wave represents repolarization of the ventricles.
D) during the P-R interval, the ventricles contract.
E) Both the QRS complex results from depolarization of the ventricles and the T wave represents repolarization of the ventricles are correct relationships.

Question

Quizplus · Accepted Answer

The QRS complex indeed reflects the depolarization of the ventricles, which is necessary for their contraction, while the T wave represents the repolarization of the ventricles, preparing them for the next cycle. The P wave is associated with atrial depolarization, not repolarization, and the P-R interval represents the time between the start of atrial depolarization and the start of ventricular depolarization, not the contraction of the ventricles.

In a Normal Electrocardiogram (ECG or EKG)