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

Q. The diagram given here is the standard ECG of a normal person. The P- wave represents the :Biology Question Image

 3851  224 NEETNEET 2013Body Fluids and Circulation Report Error

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.