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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.
Monocyte. Monocytes are produced by the bone marrow from stem cell precursors called monoblasts. Monocytes circulate in the bloodstream for about one to three days and then typically move into tissues throughout the body. They make up three to eight percent of the leukocytes in the blood.onocyte under a light microscope (40x) from a peripheral blood smear surrounded by red blood cells. Monocytes are a type of white blood cell, part of the human body 's immune system. They are usually identified in stained smears by their large two-lobed nucleus.