Body Fluids and Circulation Question 59
59. The diagram given here is the standard ECG of a normal person the $P$-wave represents the :
[NEET 2013]
(a) Initiation of the ventricular contraction
(b) Beginning of the systole
(c) End of systole
(d) Contraction of both the atria
Show Answer
Answer : d
Hints & Solutions
(d) In the given ECG of a normal person, $P$-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole.
