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(A) In a standard $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (depolarization) of the atria,which leads to the contrac

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$P$

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(A) In a standard $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (depolarization) of the atria,which leads to the contraction of both atria.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).Therefore,the $P$-wave is the correct answer.

The following is a diagrammatic representation of a standard $ECG$. Which wave represents the contraction of both atria?

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