Two hundred and six bones present in our body give us structure and movement. Bone is a framework of tough elastic protein fibres called collagen. The framework hardens and strengthens due to presence of calcium phosphate mineral. Bone is strong, yet flexible. Throughout life bone remodelling (replacement of old bones by new ones) continues through the coordinated actions of bone-removing (osteoclasts) and bone-forming (osteoblasts) cells.....Read more

Source: My Digital FC