18. Match the phases of the cardiac cycle to the description of the events. Answer 1a 1b 2a 2b 3 Phase of the cardiac cycle Ventricular Filling: Passive Ventricular Filling: Atrial Contraction Ventricular Systole: Isovolumetric Contraction Ventricular Systole: Ejection Isovolumetric Relaxation V W X Y Event Ventricles contract and intraventricular pressure rises, closing the AV valves Ventricles relax and ventricular pressure drops. Blood backflows, closing semilunar valves. Blood flows passively into the atria, through open AV valves, and into the ventricles. Rising ventricular pressure forces semilunar valves open. Blood is ejected from the heart. Z Atria contract, forcing the remaining blood into the ventricles.

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