Page 2 - 2. Circulatory system of human beings

CAPILLARIES
• Extremely thin walled blood vessels which connect arteries and vein.

• Responsible for the absorption of oxygen, digested soluble food and waste products

produced in the body.

Know More:

The weather outside of the body controls the size of blood vessels. In warmer weather, the vessels expand
to release heat, while they constrict in colder weather to retain heat.

Arteries Veins

• They carry blood from the heart to • They carry blood from the different
the different body parts. body parts to the heart.
• These are deep seated in the body. • These are superficial.
• They carry oxygenated blood (except • They carry deoxygenated blood
the pulmonary artery) (except the pulmonary vein)
• They are thick-walled. • They are thin-walled.
• There are no valves present. • A series of valves is present to
prevent the back flow of blood.