The P wave on an ECG represents which electrical event?

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Multiple Choice

The P wave on an ECG represents which electrical event?

Explanation:
The P wave represents atrial depolarization, the electrical activation of the atrial myocardium that triggers atrial contraction. It occurs as the impulse travels from the sinoatrial node through the atria, causing the atrial muscles to depolarize and contract to help fill the ventricles. This wave appears right before the QRS complex. By contrast, ventricular depolarization is shown by the QRS complex, and ventricular repolarization by the T wave. Atrial repolarization does occur, but its signal is masked by the much larger ventricular depolarization and isn’t seen as a separate deflection.

The P wave represents atrial depolarization, the electrical activation of the atrial myocardium that triggers atrial contraction. It occurs as the impulse travels from the sinoatrial node through the atria, causing the atrial muscles to depolarize and contract to help fill the ventricles. This wave appears right before the QRS complex. By contrast, ventricular depolarization is shown by the QRS complex, and ventricular repolarization by the T wave. Atrial repolarization does occur, but its signal is masked by the much larger ventricular depolarization and isn’t seen as a separate deflection.

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