X- In ECG, P- wave represents the electrical | vedclass

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(B) In an $ECG$ (Electrocardiogram):$1$. The $P-$ wave represents the electrical excitation (depolarization) of the atria,which leads to the contracti

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$X$ and $Y$ are incorrect.

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(B) In an $ECG$ (Electrocardiogram):$1$. The $P-$ wave represents the electrical excitation (depolarization) of the atria,which leads to the contraction of both the atria.$2$. The $QRS$ complex represents the depolarization of the ventricles,which initiates the ventricular contraction.$3$. Therefore,statement $X$ is incorrect because the $P-$ wave represents atrial depolarization,not ventricular excitation.$4$. Statement $Y$ is also incorrect because the $QRS$ complex represents ventricular depolarization,not atrial depolarization.$5$. Thus,both $X$ and $Y$ are incorrect.

$X-$ In $ECG,$ $P-$ wave represents the electrical excitation of the ventricle.
$Y -$ $QRS$ waves represent depolarization of atria.

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$X-$ In $ECG,$ $P-$ wave represents the electrical excitation of the ventricle.$Y -$ $QRS$ waves represent depolarization of atria.