AP BIOLOGY

Detailed explanation-1: -Mitral valve: Allows blood to flow into the left ventricle; prevents blood from flowing back into the left atrium.

Detailed explanation-2: -The atrioventricular valves prevent backflow of blood into the atria during ventricular contraction (systole), and the aortic/pulmonic (semilunar) valves prevent backflow of blood into the ventricles during ventricular relaxation (diastole).

Detailed explanation-3: -The mitral valve regulates the blood flow between the left atrium and the left ventricle. It prevents the backflow of blood to the left atrium when the left ventricle pumps blood through the aorta to the rest of the body.

Detailed explanation-4: -The pressure generated in the ventricles when the heart contracts during systole forces the atrioventricular valve leaflets back toward the atria, whereupon the leaflets meet – or coapt – to seal the annuli and prevent retrograde blood flow from the ventricles back into the atria.

Detailed explanation-5: -There are two atrioventricular valves, Mitral (Bicuspid valve) and Tricuspid valve. These valves maintain the flow of blood from atrium to ventricle and do not allow the backflow of blood from ventricles to atrium.