(A) $ECG$ is the graphical recording of electrical changes that accompany the cardiac cycle.It is represented by five waves: $P, Q, R, S,$ and $T$.The

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(A) $ECG$ is the graphical recording of electrical changes that accompany the cardiac cycle.It is represented by five waves: $P, Q, R, S,$ and $T$.The $P-$wave indicates the depolarization of the atria.The $QRS$ complex indicates ventricular depolarization.The $T-$wave indicates ventricular repolarization.