In the normal electrocardiogram, the PR interval represents:
A)atrial depolarization.
B)ventricular depolarization.
C)atrial activation to onset of ventricular activity.
D)"electrical systole" of the ventricles.

Question

Quizplus · Accepted Answer

The PR interval is a measure of time from the onset of atrial activation to the onset of ventricular activation; it normally ranges from 0.12 to 0.20 second. The PR interval represents the time necessary to travel from the sinus node through the atrium, atrioventricular (AV) node, and His-Purkinje system to activate ventricular myocardial cells.

In the Normal Electrocardiogram, the PR Interval Represents