The Heart Valves | Western Sydney University - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

374

Pages:

2
Author:

Mariam A. A.

THE HEART VALVES ● ● ● ● ● ● Valves in every chamber (between the atrium and ventricle, ventricle and great vessel = 4 valves in the heart) One way blood flow → valves, pressure and physical walls in the heart (physical walls = 2 circulations do not mix) When the heart is ready to contract the ventricle to send the blood out through the great vessel, the valve will close to prevent backflow into the atrium Cuspid = tooth like projections on the valve (set of cords pulling the cusps) Papillary muscles (pimple shaped muscles) that attach to the parachute cords (tendinous cords), make the cords cross shut (like a shoelace), no backflow of blood back to the atrium The cusps are connected to the papillary muscles via the chordae tendineae What prevents the backflow of blood between the atria and veins? ● Pressure → there are no valves between the veins and atria, when there are pressure changes that affect the function of the heart = potential for regurgitation of blood back into the veins, pressure maintained = blood shouldn’t be going backwards Atrioventricular valve (between the atrium and ventricle) ● Left AV valve (bicuspid or mitral valve) ● Right AV valve (tricuspid) Semilunar valves (aortic and pulmonary valve) ● Prevents backflow of blood back to the heart ● Pulmonary valve (right ventricle/right semilunar valve) ● Aortic valve (left ventricle/left semilunar valve) prevents the blood from going into the entrance of the aorta

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