unit 2, group 4: Mitchel, Nou, and Rita
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What is the first phase of the cardiac cycle?
Atrial Systole • AV valves open • Semilunar valves closed • Systolic contraction of atria adds final volume to ventricles (end-diastolic volume)
What happens during the 2nd phase of the cardiac cycle?
Isovolumetric contraction • All valves closed (first heart sound, S1) • Pressure in ventricles increases with systolic contraction
What happens during the 3rd phase of the cardiac cycle?
Rapid ejection -Semilunar valves open due to increased ventricular systolic pressure
What happens during the 4th phases cardiac cycle?
Reduced ejection • ventricles finish systole • total ejection from phases 3 and 4 is approx. 2/3 of the blood volume in ventricles (Stroke volume)
What is the 5th phase of the cardiac cycle?
Isovolumetric relaxtion • All valves closed (second heart sound, S2) as pressure in arteries exceeds that of ventricles • 1/3 of blood left in ventricles: end-systolic volume
What is the 6th phases of the cardiac cycle?
Rapid ventricular filling • AV valves open due to pressure of venous blood • both atria and ventricles fill with blood