The Valves of the Heart Flashcards
What are the valves composed of?
connective tissue and endocardium
Which valves are semi-lunar?
pulmonary valve and aortic valve
When are the atrioventricular valves closed?
During ventricular contraction
Which valves closing causes the first heart sound?
Atrioventricular valves
What is the valve between the right atrium and right ventricle?
Tricuspid valve
What does the mitral valve separate?
Left ventricle and left atrium
What is the mitral valve also known as?
Bicuspid valve
What are the three cusps of the tricuspid valve?
anterior, septal, posterior
What are the cusps of the mitral valve?
anterior, posterior
Which muscles contract during ventricular systole to prevent prolapse of the valve leaflets into the atria?
papillary muscles
Which valves close at the beginning of ventricular relaxation, to produce the second heart sound?
semilunar valves
Which semilunar valve has left, right and anterior cusps?
pulmonary valve
Which semilunar valve has left, right and posterior cusps?
aortic valve
Describe the sinuses of the semilunar valves
The sides of each valve leaflet are attached to the walls of the outflow vessel, which is slightly dilated to form a sinus
What is a lunule?
The thickened free superior edge of the valve leaflet
