The diagram given here is the standard ECG of a normal person, The P - wave represents the:
Initiation of the ventricular contraction
Beginning of the systole
End of systole
Contraction of both the atria
In a standard ECG, the 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, and the T-wave represents the return of the ventricles from excited to normal state (repolarisation) .
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