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(D) In an $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contraction

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Repolarisation of ventricles.

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(D) In an $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contraction of both atria.The $QRS$ complex represents the depolarization 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.,repolarization of the ventricles. The end of the $T$-wave marks the end of systole.

$T$-wave represents:

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