The appearance of the P wave on an ECG reflects which electrical event?

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Multiple Choice

The appearance of the P wave on an ECG reflects which electrical event?

Explanation:
The P wave reflects atrial depolarization—the electrical activation as the impulse from the SA node spreads through the atria, triggering atrial contraction. It appears as the small waveform before the larger QRS complex, which represents ventricular depolarization. The T wave afterward corresponds to ventricular repolarization. Atrial repolarization occurs during the QRS interval but is not seen as a separate deflection because it is masked by the much larger ventricular depolarization.

The P wave reflects atrial depolarization—the electrical activation as the impulse from the SA node spreads through the atria, triggering atrial contraction. It appears as the small waveform before the larger QRS complex, which represents ventricular depolarization. The T wave afterward corresponds to ventricular repolarization. Atrial repolarization occurs during the QRS interval but is not seen as a separate deflection because it is masked by the much larger ventricular depolarization.

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