Question

Choose the correct answer from the alternatives given.
Which of the following is a function of blood and associated blood vessels?

• A. Maintenance of osmotic balance of fluids in tissues and blood stream
• B. Protection of the body against invading microorganisms
• C. Transport of hormones
• D. All of the above

Answer 1

The correct option is D All of the above

The functions of blood are:

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. 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.

4. 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.

5. Blood Clotting: By the mechanism of clotting, loss of blood cells and body fluids is prevented.

So, the correct option is 'All of the above'.