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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.
3D Rendering of a Monocyte. Monocytes are a type of white blood cells (leukocytes). They are the largest of all leukocytes. They are part of the innate immune system of vertebrates including all mammals (humans included), birds, reptiles, and fish.They are amoeboid in shape, having agranulated cytoplasm.onocytes and their macrophage and dendritic-cell progeny serve three main functions in the immune system. These are phagocytosis, antigen presentation, and cytokine production. Phagocytosis is the process of uptake of microbes and particles followed by digestion and destruction of this material.