PATHOLOGY

Detailed explanation-1: -Both heart and veins contain valves. These valves are present to prevent the backflow of blood to their respective chambers. Valves help to ensure that the blood flow occurs in only one direction.

Detailed explanation-2: -Studies suggested that femoral veins contain between one and six valves, and popliteal veins contain between zero and four valves.

Detailed explanation-3: -Semilunar valves are present in veins. The main function of the valves in veins is to prevent back flow of blood.

Detailed explanation-4: -Interspersed throughout your veins are small crescent-shaped flaps of tissue, known as valves, that help prevent a backflow of blood. These valves project from the innermost layer of the vein wall to the center of the vein and are angled towards the heart in the direction of venous blood flow.