Dr. Lorenzo Lecture 4 Cardiac Cycle and Wiggers Diagram Flashcards
1
Q
Where do the semilunar valves prevent back flow?
A
From arteries into ventricles
2
Q
Do both semilunar and A-V valves have chordae tendineae?
A
No, only A-V nodes have them
3
Q
What does the ‘lub’ represent?
A
1st heart sound- closing of AV valves & beginning of isovolumic contraction
4
Q
What is the ‘dub’ (second sound) represent?
A
2nd heart sound- closing of semilunar valves & beginning of isovolumetric relaxation
5
Q
What is preload?
A
the degree of stratching of the ventricle experienced during diastole- directly proportional to end-diastolic volume
