AP BIOLOGY

Detailed explanation-1: -When the ventricles contract, the blood should go out of the heart and not back to the atrium. This backflow of blood is prevented by valves. Tricuspid valve prevents backflow of blood from right ventricle to right atrium. Bicuspid valve prevents backflow of blood from left ventricle to left atrium.

Detailed explanation-2: -Mitral valve: Allows blood to flow into the left ventricle; prevents blood from flowing back into the left atrium.

Detailed explanation-3: -It prevents the blood from flowing back from the aorta into the heart when the pumping chamber relaxes.

Detailed explanation-4: -The alternate name for the bicuspid valve is the mitral valve. The semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting.

Detailed explanation-5: -When the left ventricle contracts, the mitral valve closes and the aortic valve opens. This is so blood flows into the aorta and out to the rest of the body. While the left ventricle is relaxing, the right ventricle also relaxes. This causes the pulmonary valve to close and the tricuspid valve to open.