Difference Between Arteries And Veins

Human circulatory system has three types of blood vessels , the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the capillaries back toward the heart.

Arteries	Veins
Arteries are blood vessels that carry blood away from heart .	Veins are blood vessels that carry blood form all parts of body to heart .
Arteries carry oxygenated blood with exception of Pulmonary artery and Umbilical Artery . The pulmonary artery carries blood from the heart to the lungs, where it receives oxygen. The other unique artery is the umbilical artery, which carries deoxygenated blood from a fetus to its mother	Veins carry deoxygenated blood with exception of pulmonary veins which carry oxygenated blood from lungs to heart .
The root artery is the Aorta	The largest veins are the venae cavae
Valves are absent in arteries .	Valves are present in arteries to prevent backward blood flow .
Arteries have thick muscular walls .	Veins have thin non-elastic walls.
Blood flows under high pressure .	Blood flows under low pressure .