The figure below shows a typical ECG of a nor | vedclass

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(B) In a typical $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contr

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Contraction of both atria

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(B) In a typical $ECG$ (Electrocardiogram),the $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contraction of both atria.$1$. The $P$-wave indicates atrial depolarization.$2$. The $QRS$ complex represents ventricular depolarization.$3$. The $T$-wave represents ventricular repolarization (the return of the ventricles from an excited to a normal state).Therefore,the $P$-wave represents the contraction of both atria.

List $I$	List $II$
$A$. $P$ wave	$I$. Heart muscles are electrically silent.
$B$. $QRS$ complex	$II$. Depolarisation of ventricles.
$C$. $T$ wave	$III$. Depolarisation of atria.
$D$. $T-P$ gap	$IV$. Repolarisation of ventricles.

The figure below shows a typical $ECG$ of a normal human. What does the $P$-wave represent?

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