The Cardiac Cycle 3.5 / 5 based on 2 ratings ? BiologyHuman, animal and plant physiologyASOCR Created by: laurenCreated on: 06-11-12 13:04 Atrial Systole Atria contact This increases blood pressure in the atria Blood pressure in the atria is greater than that in the ventricles The pressure difference forces open the atrio-ventricular valves Blood moves from the atria into the ventricles 1 of 3 Ventricular Systole Ventricles contract This increases the blood pressure in the ventricles Blood pressure in the ventricles is greater than that in the atria The pressure difference forces the atrio-ventricular valves to close Blood pressure in the ventricles is greater than that in the arteries The pressure difference forces the semi-lunar valves to open Blood moves from the ventricles into the arteries 2 of 3 Diastole Ventricles relax This decreases blood pressure in the ventricles Blood pressure in the arteries is greater than that in the ventricles The pressure difference forces the semi-lunar valves to close Blood pressure in the ventricles is lower than that in the atria Atrio-ventricular valves fall open Blood trickles from the atria into the ventricles 3 of 3
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