Question

List three differences in arteries and veins in tabular form.

Answer 1

Hint: Blood vessels are of three types- arteries, veins and capillaries. They are a part of a closed circulatory system and help in transport of nutrients to and from the body. They differ in function and anatomy.

Complete answer:
The study of blood vessels is called angiology. There are three main types of blood vessels- arteries, veins and capillaries.

> Arteries: They are the type of blood vessel which carries the blood away from the heart. Example- Aorta. They are thick walled and carry oxygenated blood except the pulmonary artery. They divide and re-divide to form arterioles. They are deeply situated and are without valves.

> Capillaries: They are thinnest blood vessels which are involved in exchange of gases, nutrients and excretory products between blood and tissue. They are formed by division and re-division of arterioles.

> Veins: They are the type of blood vessel which carries the blood to the heart.
Example- Vena cava. They are thin walled and carry oxygenated blood except pulmonary vein. Capillaries reunite to form venules which unite veins. They are superficially situated and have semilunar valves.

ARTERY	VEIN
Thick-walled blood vessels.	Thin-walled blood vessels.
Carry oxygenated blood except pulmonary artery.	Carry deoxygenated blood except pulmonary vein.
Carries the blood away from the heart.	Carries the blood to the heart.
They are deeply situated and are without valves.	They are superficially situated and have semilunar valves.

Note: Histologically, the wall of the vein is made of three layers like the wall of artery. But the layers of the vein are relatively thin than that of the artery.