THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The aortic valve prevents backward flow from the aorta into the left ventricle.

Detailed explanation-2: -The semilunar valves act to prevent backflow of blood from the arteries to the ventricles during ventricular diastole and help maintain pressure on the major arteries. The aortic semilunar valve separates the left ventricle from the opening of the aorta.

Detailed explanation-3: -Heart valves The valves prevent blood from flowing backward. The heart has four valves. The tricuspid valve separates the right atrium and right ventricle. The mitral valve separates the left atrium and left ventricle.

Detailed explanation-4: -Semilunar valves of humans The aortic valve permits the movement of the blood in one direction from the left ventricle into arteries. Therefore, when the left semilunar valve is closed, the blood cannot go back into the ventricle. The pulmonary vessel is found between the right ventricle and the pulmonary artery.