Question

What does the time from the beginning of ventricular depolarization to the end of ventricular repolarization represent?

1) QRS complex
2) PR interval
3) QT interval
4) ST segment

Answer 1

The time from the beginning of ventricular depolarization to the end of ventricular repolarization on an ECG is represented by the QT interval.

Step-by-step explanation:

The time from the beginning of ventricular depolarization to the end of ventricular repolarization in an electrocardiogram (ECG) represents the QT interval. The QT interval includes the QRS complex, which indicates ventricular depolarization, as well as the T wave, signifying ventricular repolarization. The QRS complex exhibits the initial, rapid depolarization of the ventricles, which is crucial for the subsequent ventricular contraction. Following the QRS complex, the T wave depicts the ventricles returning to their resting state through repolarization.