Remember aortic valve is closed because pressure in aorta is greater than the pressure in left ventricle at this moment. During left atrium contraction, pressure and volume are transferred into left ventricle through opened mitral valve. When pressure in the atrium increases, blood rush into the ventricles through the opened mitral valve. This active filling of ventricles becomes valuable during physical activity. 80% of ventricular filling has been done passively even before the onset of atrial contraction and the remaining 20% of ventricular filling is due to atrial contraction. Phases of Cardiac Cycle Atrial contraction (First Phase) Events that occur in left chambers of heart, similar events occur in right chambers of heart.Įvents that occur in left chambers of heart, similar events occur in right chambers of heart. To study a particular phase of cardiac cycle, one should study what happens to atrium, ventricle, aorta/pulmonary vein, cardiac valves in that phase. One cardiac cycle = 1 systole + 1 diastole The mechanical events occurring during one systole and diastole. Master Medical Sciences with crystal clear concepts. Not a member? Sign up now to access 800+ videos on Basic Medical Sciences & Clinical Medicine.
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