Aortic valve

Aortic valve: Aortic valve is located at the root of the aorta between the aorta and the left ventricle. It prevents backflow (regurgitation) of oxygenated blood from aorta to the left ventricle when the latter relaxes (diastole) after contraction (systole). Aortic valve is a semilunar valve with three cusps, which close in diastole.