Many people believed that the bone is static and inert, but this idea isincorrect, the organic and mineral components of the bone matrix are continuallybeing recycled and renewed through a process called remodeling.
This processgoes under way throughout life, as part of normal bone maintenance. Boneremodeling plays a key factor between the activities of osteocytes, osteoblasts,and osteoclasts. In the adult stage, osteocytes are continually removing andreplacing the surrounding calcium salts. But osteoclasts and osteoblasts alsoremain active, even after the epiphyseal plates have closed.
For the most parttheir activities have a balance. As one osteon forms through the activity ofosteoblasts, another is destroyed by osteoclasts. In young adult, approximatelyeach year one fifth of the adult skeleton is demolished and the rebuilt orreplaced. The turnover and recycling of minerals give each bone the ability toadapt to new stresses. The mechanism that controls the internal organization andstructure is osteoblast. Whenever a bone is stressed, the mineral crystalsgenerate electrical fields.
Osteoblasts have an attraction to these electricalfields, and once they are in this area they begin to produce bone. Since bonesare adaptable , their shapes reflect the forces applied to them. Heavilystreeled bones become thicker and stronget, whereas bones not being accessibleto ordinary stresses will be deteriorated. Therefore is important to exercisedaily to maintain a normal bone structure.