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(D) The correct answer is $(D)$. In a standard $ECG$,the '$P$' wave represents the electrical excitation or depolarisation of the atria,which leads to

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Repolarisation of ventricles

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(D) The correct answer is $(D)$. 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,which initiates the ventricular contraction. The '$T$' wave represents the return of the ventricles from an excited to a normal state,i.e.,the repolarisation of the ventricles. The end of the '$T$' wave marks the end of systole.

In the following diagrammatic representation of a standard $ECG$,the '$T$' wave represents:

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