The diagram given here is the standard ECG of a normal person, the P-wave represents the

Options

A. contraction of both the atria
B. initiation of the ventricular contraction
C. beginning of the systole
D. end of systole

Answer

A

Explanation

(a) In ECG, P-wave represents the depolarisation of atria which leads to the concentration 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.