Which of the following is an anatomic feature unique to vein

Which of the following is an anatomic feature unique to veins? smooth muscle in the tunica media valves to prevent backflow of blood in the tunica external tunica media consists only of endothelium and a basement membrane

Solution

Answer: b. valves to prevent backflow of blood

Explanation- The pressure of the blood is low in veins and valves maintain unidirectional flow of blood. Veins carry deoxygenated blood from the peripheral tissue to the heart.