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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.
1 These bone building cells arise from the osteoprogenitor cells in periosteum in bone marrow. 2  monomucleate cells, expressess all receptors of the fibroblassts in addition to genes for sialoprotein and osteocalcin.3  Consists of high amount of RER large Golgi apparatus with spherical nucleus.ONE BUILDING CELLSBone can be defined as the rigid endoskeleton of calcium phosphate and forms the endoskeleton of the body. The skeletal system formed by the bones is the unit that is associated with the muscular system that enables movement.