The QRS complex in a standard ECG represents: | vedclass

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

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Depolarisation of ventricles

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

The $QRS$ complex in a standard $ECG$ represents:

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