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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.
A monocyte (pictured below) is a large type of white blood cell with one large, smooth, well-defined, indented, slightly folded, oval, kidney-shaped, or notched nucleus (the cell s control center). White blood cells help protect the body against diseases and fight infections.