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The mononuclear phagocyte system constitutes macrophage cells spread throughout the human body. The macrophages are long-lived cells that provide a major defense system against hostile elements through phagocytosis and subsequent intracellular destruction of the particle or cell.
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.n addition, monocytes and lymphocytes are also known as mononuclear cells. Neutrophils. Within 12 hours of being discharged from the marrow into the bloodstream, neutrophils migrate into the extravascular tissue. Tissue neutrophils are activated by chemoattractants at the site of injury.