The P wave of a normal electrocardiogram coincides with which electrical events in the heart.

Question

BlackTom AI · Accepted Answer

The question asks which electrical events in the heart coincide with the P wave on a normal ECG. 
Option 1: 'Atrial repolarization' — Atrial repolarization does occur, but it is not visible as a separate deflection on a normal ECG because it is masked by the much larger QRS complex that accompanies ventricular depolarization. Therefore this choice is incorrect.
Option 2: 'Ventricular repolarization' — Ventricular repolarization corresponds to the T wave on the ECG, not the P wave. This makes the option incorrect.
Option 3: 'Atrial depolarization' — This is the correct association. The P wave represents the depolarization of the atria as the electrical impulse from the SA node spreads through the atrial myocardium, initiating atrial contraction. 
Option 4: 'Ventricular depolarization' — Ventricular depolarization is reflected by the QRS complex, not the P wave. Since the QRS complex corresponds to ventricular depolarization, this option is incorrect.

The P wave of a normal electrocardiogram coincides with which electrical events in the heart.Single choice

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