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Unit 3-Lecture 3.pptx - Unit 2 The Heart Lecture 3-The...

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Unit 2 – The Heart Lecture 3-The Cardiac Cycle
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Cardiac cycle refers to all events associated with blood flow through the heart Systole – contraction of heart muscle Diastole – relaxation of heart muscle Cardiac Cycle
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Ventricular filling – mid-to-late diastole Heart blood pressure is low as blood enters atria and flows into ventricles AV valves are open, then atrial systole occurs Phases of the Cardiac Cycle
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Ventricular systole Atria relax Rising ventricular pressure results in closing of AV valves Isovolumetric contraction phase Ventricular ejection phase opens semilunar valves Phases of the Cardiac Cycle
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Isovolumetric relaxation – early diastole Ventricles relax Backflow of blood in aorta and pulmonary trunk closes semilunar valves Dicrotic notch – brief rise in aortic pressure caused by backflow of blood rebounding off semilunar valves Phases of the Cardiac Cycle
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Figure 18.20
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