Flashcards in 4/ the cardiac cycle Deck (11):
how relaxed are both ventricles during late diastole and do they fill actively or passively?
both sets of chambers are relate and ventricles fill passively
what happens during atrial systole? where does the blood go?
atrial contraction forces a small amount of additional blood into ventricles
what happens during isovolumic ventricular contraction?
first phase of ventricular contraction pushes AV valves closed but does not create enough pressure to open semilunar valves
what happens during ventricular ejection phase?
as ventricular pressure rises and exceeds pressure in the arteries, the semilunar valves open and blood is ejected
what happens during isovolumic ventricular relaxation?
as ventricules relax, pressure in ventricles falls, blood flows back into cusps of semilunar valves and snaps them closed
between which two phases does S1 begin?
atrial systole/ ventricular systole (isovolumic ventricular contraction + ventricular ejection)
when does S2 end?
after ventricular ejection
how does stenosis of aortic or pulmonary valve or regurgitation through mitral or tricuspid appear on phonocardiogram?
constant murmur between systole and diastole (in that order)
how does stenosis of mitral or tricuspid valve or regurgitation through aortic or pulmonary appear on phonocardiogram?
constant murmur between, diastole and systole (in that order)
how does a septal defect appear on phonocardiogram?
constant murmur all the time, may muffle noise of valves closing