4/ the cardiac cycle Flashcards Preview

S2 Cardiovascular System > 4/ the cardiac cycle > Flashcards

Flashcards in 4/ the cardiac cycle Deck (11):
1

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

2

what happens during atrial systole? where does the blood go?

atrial contraction forces a small amount of additional blood into ventricles

3

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

4

what happens during ventricular ejection phase?

as ventricular pressure rises and exceeds pressure in the arteries, the semilunar valves open and blood is ejected

5

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

6

between which two phases does S1 begin?

atrial systole/ ventricular systole (isovolumic ventricular contraction + ventricular ejection)

7

when does S2 end?

after ventricular ejection

8

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)

9

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)

10

how does a septal defect appear on phonocardiogram?

constant murmur all the time, may muffle noise of valves closing

11

look at slide 3 (cardiac cycle, monday 13th/02)/ wiggers diagram

-