-unspecialized stem cells from mesenchyme
-only cell that undergoes cell division
-found in inner portion of peristonum, in endosteum, and in canals of bone
-bone building cells, maintain bone matrix
-synthesize and secrete collagen fibers and other components needed for extracellular matrix and initiate calcification
-mature bone cells, maintain bone tissue
-maintain daily metabolism and exchange nutrients and wastes with blood
-derived from fusion of huge 50 monocyte white blood cells
-resorption: breakdown of extracellular matrix for normal development, maintanence, and repair of bone
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