In ECG, P-R interval corresponds to
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Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.
The P - wave represents the electrical excitation or depolarization of 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 excited to a normal state or repolarization.
The end of the T-wave marks the end of systole.
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