Osteoclasts : Cells that destroy or clean away old bone, replacing 10 per cent of the bone each year., Throughout ossification, parts of the bone are reabsorbed, so unnecessary calcium is removed via the osteoclasts while new layers of bone tissue are created., Osteoblasts: Cells that build bone by brining calcium to the bones., Created by exercising more, resulting in stronger bones as more demands are placed upon them. Bone calcium stores increase to cope with the demand for calcium., Activities that build stronger bones include load-bearing exercises such as tennis, netball and running., Osteocytes: Cells that grow the tissue, They form from osteoblasts and make up the majority of mature bone matter.,

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