Identify the correct sequence of the cardiac cycle.
(i) Blood through the pulmonary vein and vena cava enters in left and right atria respectively.
(ii) AVN generates action potential for the ventricles.
(iii) SAN bring about atrial systole .
(iv) Ventricular systole pushes blood away from the heart .
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i) Is the correct answer because it is the right sequence.
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