PR interval in ECG denotes ?
Isovolumetric contraction of ventricle
Insovolumetric relaxation of hea
Atrial contraction
None
Ans. is 'c' i.e., Atrial contractionPR interval represents atrial depolarization (atrial contraction) and condution throught AV nudeElectrocardiogram Normal ECG in a bipolar limb leads typically shows five waves named P, Q, R, S and T. Q, R and S waves are collectively called QRS complex.