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White blood cells known as lymphocytes arise from by mitosis of stem cells in the bone marrow. Some lymphocytes migrate to the thymus and become T cells that circulate in the blood and are associated with the lymph nodes and spleen.
Lymphocytes are the second most common (neutrophils are most common) circulating white blood cells. There are three major types of lymphocytes-B cells, T cells, and natural killer cells (NK cells).These cells are further divided into subtypes based on their function. ( 1 800-3,200 cells/ÂµL; 80% of total lymphocytes).BC: White Blood Cells (WBC). White blood cells (leukocytes) are major players in the immune system and help defend against infection and disease. There are several different types of white blood cells with different functions.