A) contraction of both the atria
B) initiation of the ventricular contraction
C) beginning of the systole
D) end of systole
Correct Answer: A
Solution :
In ECG, P-wave represents the depolarization of atria, which leads to the contraction of both atria. T-wave represents the return of ventricles from excited to normal state. The QRS complex represents the depolarisation of the ventricles, which initiates ventricular contraction. The contraction starts shortly after Q and marks the beginning of systole.
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