The QRS Complex represents which event on the ECG?

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Multiple Choice

The QRS Complex represents which event on the ECG?

Explanation:
The QRS complex shows ventricular depolarization—the electrical activation that causes the ventricles to contract and push blood out to the lungs and the rest of the body. The P wave before it represents atrial depolarization, and the T wave after it represents ventricular repolarization. Atrial repolarization does occur during the QRS, but it’s masked by the much larger ventricular depolarization, so it isn’t seen as a separate wave. The sharp, rapid deflections reflect the fast conduction through the ventricles as they activate.

The QRS complex shows ventricular depolarization—the electrical activation that causes the ventricles to contract and push blood out to the lungs and the rest of the body. The P wave before it represents atrial depolarization, and the T wave after it represents ventricular repolarization. Atrial repolarization does occur during the QRS, but it’s masked by the much larger ventricular depolarization, so it isn’t seen as a separate wave. The sharp, rapid deflections reflect the fast conduction through the ventricles as they activate.

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