Lecture 5: ANATOMY OF THE HEAT, PART 2 Flashcards
What valves does each side of the heart have?
A semilunar valve and an atrioventricular valve
Where is the atrioventricular valve found?
Between the atrium and the ventricle
Where is the semilunar valve found?
Between the ventricle and the outflow artery
What is the function of atrioventricular valves?
To prevent blood returning to the atria during ventricular contraction
What is the AV valve on the right side?
The tricuspid valve
How many leaflets/cusps does the tricuspid valve have?
3
What is the AV valve on the left side?
The bicuspid (mitral) valve
How many leaflets/cusps does the bicuspid valve have?
2
What is the filling phase called?
Diastole
What is the squeezing phase called?
(ventricular) systole
How is theAV valve during diastole?
Open to allow blood to drain into the ventricle
How is the semilunar valve during diastole?
Closed to prevent blood from leaving the ventricle
How is the AV valve in (ventricular) systole?
Closed to prevent blood flowing back into the atrium
How is the semilunar valve during (ventricular) systole?
Open to allow blood to exit the ventricle
What is the function of semilunar valves?
To prevent blood returning to ventricles during filling (diastole)
What is the semilunar valve on the right side?
The pulmonary (semilunar) valve
How many cusps does the pulmonary (semilunar) valve have?
3
What does the pulmonary (semilunar) valve control?
Flow into the pulmonary circulation
What is the semilunar valve on the left side?
The aortic (semilunar) valve
How many cusps does the aortic (semilunar) valve have?
3
What does the aortic (semilunar) valve control?
Flow from the left ventricle to the aorta
When are semilunar valves pushed open?
As blood flows out of the heart
When do semilunar valves close?
As the blood starts to backflow
What is the size comparison of AV and semilunar valves?
Semilunar valves are much smaller than AV valves
How is the AV leaflet described?
Large and flappy
What would the AV leaflet do if there was nothing preventing it shutting?
It would slam shut
What are papillary muscles?
Finger-like projections of the ventricular wall
What do papillary muscles do?
Tension early in systole