The QRS complex on an ECG corresponds to which cardiac event?

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Multiple Choice

The QRS complex on an ECG corresponds to which cardiac event?

Explanation:
The QRS complex shows ventricular depolarization—the electrical activation that triggers the ventricles to contract. Think of the ECG as a timeline of heart muscle activation: the P wave is atrial depolarization, then the QRS complex carries the rapid spread of impulse through the ventricles, and the T wave represents ventricular repolarization as they reset for the next beat. Atrial repolarization does occur, but it is hidden within the QRS interval and not seen as a separate feature. Ventricular repolarization appears later as the T wave. So the QRS complex is best understood as the electrical signature of the ventricles activating and preparing to contract.

The QRS complex shows ventricular depolarization—the electrical activation that triggers the ventricles to contract. Think of the ECG as a timeline of heart muscle activation: the P wave is atrial depolarization, then the QRS complex carries the rapid spread of impulse through the ventricles, and the T wave represents ventricular repolarization as they reset for the next beat. Atrial repolarization does occur, but it is hidden within the QRS interval and not seen as a separate feature. Ventricular repolarization appears later as the T wave. So the QRS complex is best understood as the electrical signature of the ventricles activating and preparing to contract.

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