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

Options

A. Beginning of the systole
B. End of systole
C. Contraction of both the atria
D. Both 1 & 3

Answer

D

Explanation

Both the option (1) and (3) , are correct
P wave represents atrial depolarisation , i.e., atrial systole (contraction of atria). Cardiac cycle consists of first systole of heart followed by diastole. Cardiac systole consists of first atrial systole, followed by ventricular systole. Thus beginning of systole of heart is represented by atrial systole which is further respresented by the P wave.