Question

A type of granulocyte (i) and agranulocyte (ii) are phagocytic cells that destroy foreign organisms entering the body. (iii) secrete histamine, serotonin, heparin, etc., and are involved in inflammatory reactions. (iv) resist infections and are also associated with allergic reactions. (v) are responsible for the immune responses of the body. Identify each of them.

• A.

  (i)	(ii)	(iii)	(iv)	(v)
  Monocytes	Neutrophils	Basophils	Eosinophils	Lymphocytes

• B.

  (i)	(ii)	(iii)	(iv)	(v)
  Neutrophils	Monocytes	Basophils	Eosinophils	Lymphocytes

• C.

  (i)	(ii)	(iii)	(iv)	(v)
  Neutrophils	Monocytes	Eosinophils	Basophils	Lymphocytes

• D.

  (i)	(ii)	(iii)	(iv)	(v)
  Monocytes	Neutrophils	Eosinophils	Basophils	Lymphocytes

Answer 1

Answer: (B)

Neutrophils, eosinophils, and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes. Neutrophils are the most abundant cells (60-65 percent) of the total WBCs and basophils are the least (0.5-1 percent) among them. Neutrophils and monocytes (6-8 percent) are phagocytic cells that destroy foreign organisms entering the body. Basophils secrete histamine, serotonin, heparin, etc., and are involved in inflammatory reactions. Eosinophils (2-3 percent) resist infections and are also associated with allergic reactions. Lymphocytes (20-25 percent) are of two major types - ‘B’ and ‘T’ forms. Both B and T lymphocytes are responsible for immune responses of the body.