In this Video, Dr. Priyanka Dadupanthi, Assistant Professor, Biyani Group of colleges, describes about physiology of circulating system. Heart is important part of circulating system. Heart beat generates through systole and diastole. Rhythmic contraction & relaxation in heart is known as Heart beat or cardiac cycle. Cardiac cycle divided into three stages: Arterial systole, ventricular systole and ventricular Diastole.