Question

What is the different between artery and vein

Answer 1

Arteries

All blood vessels leading from the heart are called arteries or the blood vessels which carry blood from the heart to various body organs are called arteries. All arteries carry oxygenated blood (pure blood) except pulmonary artery, which carries deoxygenated blood.

The wall of the artery consists of three layers, namely tunica interna, tunica media and tunica externa.

Difference Between Artery and Vein

Artery

1. Vessels which carry blood from the heart to various body parts 
2. Arteries carry oxygenated blood from the heart except pulmonary artery 
3. Arteries have thick elastic muscular walls 
4. Valves are absent 
5. Blood flows under high pressure 
Vein 
1. Vessels which carry blood from the various body parts to the heart 
2. Veins carry deoxygenated blood from the various body parts except pulmonary vein 
3. Veins have thin non elastic walls 
4. Valves are present to prevent the backward flow of blood 
5. Blood flows under low pressure 
Extra points: 

The study of blood vessels is called Angiology

Variocse veins are the swollen veins formed by improper valve function

Answer 2

arteries carry oxygenated blood and veins carry deoxygenated blood .
But pulmonary artery carries deoxygenated blood and pulmonary vein carries 
oxygenated blood