PATHOLOGY

Detailed explanation-1: -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.)

Detailed explanation-2: -Structures called valves are present in veins and lymph ducts but are absent in arteries. These valves mainly prevent the backflow of blood in the vessels. Due to the high pressure of blood flowing n the arteries, they do not require valves to prevent backflow of the blood.

Detailed explanation-3: -It is used to return the blood to the heart. Three kinds of blood vessels are capillaries, veins and arteries. Arteries used to carry the oxygenated blood away from the heart. Valves are present only in the veins and not in the capillaries and arteries.