Heart Valves Flashcards
what are valves
allows blood to flow in only one direction through the heart chambers from the artia through the ventricles and out the great arteries leaving the heart
what are the four valves
atrioventricular:
tricuspid (right)
Biscuspid (left)
Semilunar valves:
pulmonary semilunar valve
aortic semilunar valve
what’s the different between tricuspid and bicuspid
tricuspid is the right valve in AV which has 3 cusps
biscupid is the left valve in AV which has 2 cusps
what is the chordae tendineae
heart strings that anchor the cusps to the walls of the ventricles
what is does the atrioventricular valves do
seperate the atrium to the ventricles, to prevent the blood from going backwards when the ventricles contract
what happens when the ventricles contract
the cusps are forced open and flatten against the walls of the arteries y the rushing of blood
what happens to the cusps when the ventricles are closed
the cusps are tightly fit together
do valves operate at the same time or different times
different times
when do the AV valves operate and don’t operate
they operate when the heart is in relaxation
they don’t operate when the ventricles are contracting
when do the semilunar valves operate and don’t operate
they operate when the ventricles are contracting
they don’t operate when the hearts in relaxation
why does contracting mean
tension-generating sites within muscle cells
what happens to the cusps when the ventricles relax
the cusps fill with blood like a balloon filling with air which closes the valves
