KINESIOL 4SS3 Lecture Notes - Lecture 8: Bone Density, Bone Resorption, Hip Fracture
12 Apr 2016
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Document Summary
Reservoir for minerals, systemic regulatory hormones, and inlammaion-mediated factors. 99% of body ca lies in bone: when demand for ca increases, it comes from bone. Bone is a dynamic issue, undergoing coninuous cycles of formaion and resorpion (remodeling), based on the acivity of 2 speciic cells: osteoblasts (formaion) adding bone mineral, osteoclasts (resorpion) losing bone mineral. Resing phase preosteoclasts (chipping away) resorpion by osteoclasts osteoblasts (illing in bone) formaion by osteoblasts mineralizaion of new bone. Bone formaion: 3-6 months: therefore, with studies you should have about 9 months to a year to get the full cycle. Adult bones composed of 2 types of issue: compact bone. Accounts for 75-80% of total skeletal mass, but only 33% of total bone surface. Found in the shats of long bones: cancellous (spongy) bone. Found primarily in spine, pelvis and ends of long bones (higher surface-volume raio) Bone loss in men and women 50-80 years.
