AP BIOLOGY

Detailed explanation-1: -The pulmonary valve prevents blood from going backward from the pulmonary artery to the right ventricle. Mitral valve: This valve has two leaflets. They allow blood to flow from the lungs into the left atrium. And they prevent backward flow from the left ventricle to the left atrium.

Detailed explanation-2: -Aortic valve: Allows blood to pass from the left ventricle to the aorta; prevents backflow of blood into the left ventricle.

Detailed explanation-3: -Each valve has flaps-called leaflets for the mitral and tricuspid valves and cusps for the aortic and pulmonary valves. These flaps should open and close once during each heartbeat. Valves that don’t open or close properly disrupt blood flow through the heart to the body.

Detailed explanation-4: -The tricuspid valve prevents backflow from the right ventricle into the right atrium. The bicuspid valve prevents backflow from the left ventricle into the left atrium. The semilunar valves prevent backflow into the ventricles from the aorta and pulmonary arteries.