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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 is a leukocyte, or a white blood cell. Monocytes differentiate into macrophages, which devour foreign substances in the body. Monocytes circulate throughout the bloodstream and into tissues, when they leave the bloodstream they are called wandering macrophages. dark_princess Â· 8 years ago. Thumbs up. 0.