ANP 1105 Lecture Notes - Lecture 15: Pulmonary Valve Stenosis, Heart Valve, Pulmonary Valve

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

6 the cardiac cycle: systole: contraction of heart; pumping out blood, diastole: relaxation of heart; filling of heart cavities with blood, cardiac cycle: atrial systole + diastole ventricular systole + diastole, start = mid-to-late diastole, 1. Period of ventricular filling: mid-to-late diastole pressure low (but. Isovolumetric relaxation: early diastole ventricles relax; pressure decreases rapidly; backflow of aortic/pulmonary blood closes sl valves (dicrotic notch); ventricles a closed system = isovolumetric relaxation: 4. ** electrical activity of left & right hearts is almost simultaneous. In this example there is pulmonary valve stenosis. The first heart sound is a result of closure of the av valves and closure of the sl valves causes the second heart sound. The heart chambers that have just been filled when you hear the first heart sound are the ventricles. The chambers that have just emptied when you hear the first heart sound are the atria.