Which ECG component signifies the electrical stimulation (contraction) of the ventricles?

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Multiple Choice

Which ECG component signifies the electrical stimulation (contraction) of the ventricles?

Explanation:
The ventricles contract when they become electrically activated, which is shown on the ECG as the QRS complex. This rapid depolarization of the ventricular myocardium triggers the strong, synchronized contraction that pumps blood out of the heart. The P wave represents atrial depolarization (atrial contraction), the T wave reflects ventricular repolarization (relaxation), and the PR segment is the delay in conduction through the AV node before the ventricles depolarize. So the QRS complex is the electrical sign of ventricular contraction.

The ventricles contract when they become electrically activated, which is shown on the ECG as the QRS complex. This rapid depolarization of the ventricular myocardium triggers the strong, synchronized contraction that pumps blood out of the heart. The P wave represents atrial depolarization (atrial contraction), the T wave reflects ventricular repolarization (relaxation), and the PR segment is the delay in conduction through the AV node before the ventricles depolarize. So the QRS complex is the electrical sign of ventricular contraction.

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