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osteoblasts large, granular cells, can't undergo mitosis, found on surface of bone form bone, secrete the osteoid: collagen, proteoglycans, glycoproteins. Osteoblast are cuboidal mononuclear bone cells 15-30 Âµm in length, which form a contiguous monolayer over the surface of bone. They are derived from marrow stromal cells by differentiation of pre-osteoblasts and not themselves undergo mitosis.
The osteoclasts are a type of bone cells. The bone cells are found within the bone tissues, and they are responsible for the make-up of the skeleton of vertebrates. The four main types of bone cells are the (1) osteoclasts, (2) osteoblasts, (3) osteocytes, and (4) lining cells. The osteoclasts, in particular, are large, multinucleated cells that are involved in the absorption and removal of bone, particularly dissolving the fibers and the matrix of bone.