BIOC34H3 : study guide
Document Summary
Bicuspid valve: passive flow of blood into aorta, aorta acts as pressure reservoir. *phase 3: [systole period] ventricular ejection: pressure in lv /rv > pressure in aorta /pulmonary arteries. , causing emptying of ventriles: respective semilunar valve open, volume in ventricles decreases, aortic pressure reaches maximum here (gives systolic pressure 120 mmhg) *phase 4: [early diastole period] isovolumetric relaxation: constant blood volume again in ventricles, dichrotic notch: small hike in aortic pressure due to aortic valve closure, pressure in aorta/pulmonary arteries > pressure in lv/rv. Cardiac cycle time allocation: diastole: 65% of the time, systole: 35% of the time. Left atrium to left ventricle: bicuspid valve separates left atrium from left ventricle, same mechanism. Left ventricle to aorta: aortic valve/ semilunar valve separates the left ventricle from the aorta (systematic circulation, when pressure in lv > pressure in aorta, aortic valve remains closed, open when vice-versa happens.
