The time from the beginning of atrial depolarization to the beginning of ventricular depolarization is shown on the ECG waveform as the:
A)QRS complex.
B)PR interval.
C)QT interval.
D)ST segment.

Question

Quizplus · Accepted Answer

The PR interval represents the time interval between the beginning of atrial depolarization (P wave) and the beginning of ventricular depolarization (QRS complex). Therefore, the correct answer is B. The QRS complex represents ventricular depolarization, the QT interval represents ventricular depolarization and repolarization, and the ST segment represents the time between ventricular depolarization and repolarization.

The Time from the Beginning of Atrial Depolarization to the Beginning