bone remodelling
throughout life bones are remodeled a reshaping process in which old bone tissue is removed and new tissue is added Remodelling maximizes the strength of bones in response to changing mechanical demands or forces. Up to 10 per cent of an adults skeleton can be replaced annually. Remodelling has two distinct stages - bone resorption and bone deposition - performed by bone cells called osteoclasts and osteoblasts, which have opposing actions. Osteoclasts break down and remove old bonematrix