Describe what happens during systole in the cardiac cycle? (5)

Blood flows into atria + ventricles bec low P bec low V of blood when ventricles is full = atria contacts = increase P in atria to force all blood into ventricles When ventricles contract AV valves close to stop backflow = first sound P increases in contracting ventricles = isovolumetric contraction when ventricular P > BP in aorta = AV opens = blood released in aorta