The diagram given here is the standard ECG of | vedclass

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(D) In a standard $ECG$,the $P$-wave represents the electrical excitation or depolarization of the atria,which leads to the contraction of both the at

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Contraction of both the atria

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(D) In a standard $ECG$,the $P$-wave represents the electrical excitation or depolarization of the atria,which leads to the contraction of both the atria.Following this,the $QRS$ complex represents the depolarization of the ventricles,which initiates ventricular contraction.The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarization).

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

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