The QRS complex on an electrocardiogram represents which electrical event?

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Multiple Choice

The QRS complex on an electrocardiogram represents which electrical event?

Explanation:
The QRS complex represents ventricular depolarization—the rapid activation of the ventricles as the electrical impulse travels through the His-Purkinje system and ventricular myocardium, triggering their contraction. The P wave corresponds to atrial depolarization, and the T wave to ventricular repolarization. Atrial repolarization occurs during the QRS but is masked by its much larger deflection. So, the electrical event the QRS complex reflects is the ventricles becoming activated and ready to contract.

The QRS complex represents ventricular depolarization—the rapid activation of the ventricles as the electrical impulse travels through the His-Purkinje system and ventricular myocardium, triggering their contraction. The P wave corresponds to atrial depolarization, and the T wave to ventricular repolarization. Atrial repolarization occurs during the QRS but is masked by its much larger deflection. So, the electrical event the QRS complex reflects is the ventricles becoming activated and ready to contract.

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