Given below is the ECG of a normal human. Whi | vedclass

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(C) The $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contraction of both the atria.The $QRS$ comp

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Complex $QRS -$ One complete pulse

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(C) The $P$-wave represents the electrical excitation (or depolarization) of the atria,which leads to the contraction of both the atria.The $QRS$ complex represents the depolarization of the ventricles,which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole.The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarization). The end of the $T$-wave marks the end of systole.Therefore,the $QRS$ complex corresponds to the depolarization of the ventricles,which initiates ventricular contraction,effectively representing one complete pulse or heartbeat cycle in terms of electrical activity.

Given below is the $ECG$ of a normal human. Which one of its components is correctly interpreted below?

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