Lymphocytes are small in size, round and have large nuclei. It is alkaline and alkaline. Its diameter is 6-16 µm. Their number is 1680 per cubic milliliter. 24% of white blood cells are lymphocytes. Life expectancy is 7 days. It is produced from red bone marrow, liver, spleen and lymph glands. There are three types of lymphocytes.
(i) B-lymphocytes: B-lymphocytes are derived from thymocytes of the thymus gland.
(ii) T-lymphocytes: T-lymphocytes are derived from hematopoietic progenitor cells of bone marrow.
(iii) NK cells: NK cells are toxic to other cells and are detrimental to immunity.