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The diagram given here is the standard ECG of a normal person. The P-wave represents the
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contraction of both the atria
In ECG, P-wave represents the depolarisation 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.
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