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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. Two main types of lymphocytes are B-cells and T-cells. B-cells are characterized by the presence of immunoglobulins on their surface, and upon stimulation with antigen, they are transformed into plasma cells.Plasma cells are then able to secrete antibodies specific to the antigen.ollectively, neutrophils, eosinophils, and basophils are known as granulocytes due to the presence of granules in their cytoplasm. In addition, monocytes and lymphocytes are also known as mononuclear cells.