Cardiac Cycle 0.0 / 5 ? BiologyCellular processesA2/A-levelOCR Created by: saifkhan00Created on: 03-05-18 18:40 Atrial Systole AV valves open, semilunar valves closed. Atria contract, ventricles relax. 1 of 5 Early Ventricular Systole Atria relax and ventricles contact. AV valves forced closed, semilunar valves still closed. 2 of 5 Late Ventricular Systole Atria relax, and ventricles contract. AV valves remain closed, semilunar valves forced open. 3 of 5 Early Ventricular Diastole Atria and ventricles relax. AV valves and semilunar valves closed, so atria being passively filling w/ blood. 4 of 5 Late Ventricular Diastole Atria and ventricles relax. Atria passively fills with blood, as AV valves open and semilunar valves closed. 5 of 5
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