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

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(A) The correct answer is $(A)$. By counting the number of $QRS$ complexes that occur in a given time period,one can determine the heart beat rate (pu

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$QRS$ complex - one complete pulse

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(A) The correct answer is $(A)$. By counting the number of $QRS$ complexes that occur in a given time period,one can determine the heart beat rate (pulse) of an individual. The $P$-wave represents the electrical excitation (depolarisation) of the atria,which leads to the contraction of both the atria. The $QRS$ complex represents the depolarisation of the ventricles,which initiates the ventricular contraction. The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarisation). The end of the $T$-wave marks the end of systole.

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

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