In a standard ECG,which one of the following | vedclass

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(C) The correct answer is $C$.In a standard $ECG$:$1$. The $P$-wave represents the electrical excitation (or depolarisation) of the atria,which leads

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$P$ - depolarisation of the atria

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(C) The correct answer is $C$.In a standard $ECG$:$1$. The $P$-wave represents the electrical excitation (or depolarisation) of the atria,which leads to the contraction of both atria.$2$. The $QRS$ complex represents the depolarisation of the ventricles,which initiates ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole.$3$. The $T$-wave represents the return of the ventricles from an excited state to a normal state (repolarisation). The end of the $T$-wave marks the end of systole.

In a standard $ECG$,which one of the following alphabets is the correct representation of the respective activity of the human heart?

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