(i) Respiratory function:
Blood transports oxygen from the lungs to body organs and C02 from body organs to lungs.
(ii) Transport of food:
Blood carries digested food to different cells of the body.
(iii) Transport of hormones:
Hormones are transferred from their place of secretion to their place of action through blood.
Blood also maintains proper body temperature.
(v) Regulation of water and balance of acid and base:
Blood brings about the balance of acid, base and regulates water contents of the body.
(vi) Removal of metabolic wastes:
Blood carries various metabolic wastes to kidney, skin and intestines for excretion.
(vii) Besides the above functions blood also protects our body against micro-organisms.
(viii) Blood also helps in the formation of a clot in the event of an injury to prevent further loss of blood.