PCB 3713C Study Guide - Final Guide: Cardiac Muscle, Skeletal Muscle, Sarcomere
25 May 2016
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Segment represents the instant at which the mitral valve opens. As the mitral valve opens, the ventricle begins to fill passively because atrial pressure higher than ventricular pressure. Segment bc during a second phase of ventricular filling, volume rises markedly from 70 to 120 ml, accompanied by a rather modest increase in pressure from 5 to 10 mm hg. The modest rise in pressure, despite a doubling of ventricular volume, reflects the high compliance (c = v/ p) of the ventricular wall during late diastole. Segment cd point c represents the closure of the mitral valve. At this point, ventricular filling has ended and isovolumetric contraction represented by the vertical line cd is about to begin. Segment de point d represents the opening of the aortic valve. With the outlet to the aorta now open, the ventricular muscle can begin to shorten and to eject blood. reaching a peak systolic value of 130 mm hg at point e.
