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The P-wave of an ECG represents

AAtrial repolarisation hidden in QRS
BAtrial depolarisation before contraction
CVentricular depolarisation before contraction
DVentricular repolarisation at end systole
Answer & Solution
Correct answer: B. Atrial depolarisation before contraction
P-wave = atrial depolarisation that initiates atrial contraction. QRS complex = ventricular depolarisation initiating ventricular contraction. T-wave = ventricular repolarisation.
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