During atrial systole, atria contract, pushing blood into relaxed ventricles, opening AV valves and closing semilunar valves. During ventricular systole, ventricles contract, pushing blood into the aorta/pulmonary artery, closing AV valves and opening semilunar valves. During diastole, all chambers relax, and blood flows from atria to ventricles as AV valves open and semilunar valves remain closed.
During atrial systole, atria contract, pushing blood into relaxed ventricles, opening AV valves and closing semilunar valves. During ventricular systole, ventricles contract, pushing blood into the aorta/pulmonary artery, closing AV valves and opening semilunar valves. During diastole, all chambers relax, and blood flows from atria to ventricles as AV valves open and semilunar valves remain closed.
| Front | Describe the events in the cardiac cycle including what is contracting or relaxing, changes in pressure in chambers, opening or closing of valves and direction of flow. | ||||||||||||||||||||
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