Some of the most vital functions of Blood are : 1. Transport of nutrition, 2. Transport of respiratory gases, 3. Acts as a Vehicle, 4. Drainage of Waste Products:, 5. Blood Clotting:, 6. Regulation of body temperature, 7. Defense actions and 8. Regulates blood pressure.
1. Transport of nutrition:
The blood is the means whereby all nourishment is transported to the cells.
2. Transport of respiratory gases:
The blood transports Oxygen as oxy hemoglobin from the lungs to the blood cells and returns carbon dioxide from the cells to the lungs for excretion.
3. Acts as a Vehicle:
The blood transports hormones and enzymes from their place of origin to their target organs and tissues (place of activity).
4. Drainage of Waste Products:
The blood removes all waste products from the tissues and cells. These waste products are transported to the appropriate organs for excretion-lungs, kidney’s, intestine, skin etc.
5. Blood Clotting:
By the mechanism of clotting, loss of blood cells and body fluids is prevented.
6. Regulation of body temperature:
Blood helps to maintain the body temperature by distributing the heat produced by the chemical activity of the cells evenly, throughout the body.
7. Defense actions:
The blood aids in the defense of the body against the invasion of micro-organisms and their toxins due to:
(a) The phagocyte action of neutrophils and monocytes.
(b) The presence of antibodies and antitoxins.
8. Regulates blood pressure:
Blood regulates blood pressure.