Ans :
A normal electrocardiogram composed of-
P wave - caused by atrial depolarization before atrial contraction begins.
Q wave - caused by septal depolarization.
R wave - caused by apical left ventricular depolarization.
S wave - caused by post basal left ventricular depolarization.
T wave- caused by ventricular depolarization.
QRS complex - Cased by ventricular depolarization.
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