Veins are blood vessels that are part of the circulatory system, responsible for carrying deoxygenated blood back to the heart. They form a network throughout the body, alongside arteries and capillaries. Veins have thinner walls compared to arteries and contain valves that help prevent backflow of blood.
The primary function of veins is to return blood from the body's tissues and organs back to the heart. This blood is typically low in oxygen and high in waste products, having already delivered.
