ANATOMY

Detailed explanation-1: -Veins have valves that prevent the backward flow of the blood.

Detailed explanation-2: -The veins are the blood vessels that have valves in them. The veins carry deoxygenated blood from body to heart. The veins have valves to ensure blood flows in only one direction.

Detailed explanation-3: -Blood flow within your legs occurs mainly through the deep venous system. Femoral veins typically have between one to six vein valves, and popliteal veins often contain between zero to four valves. Valves in veins are bicuspid, meaning they have two flap-like structures that regulate blood flow.

Detailed explanation-4: -Many veins, particularly those in the arms and legs, have one-way valves. Each valve consists of two flaps (cusps or leaflets) with edges that meet. Blood flowing toward the heart pushes the flaps open like a pair of one-way swinging doors.

Detailed explanation-5: -Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)