Changes

'''Bone''' is living, growing [[tissue]] made mostly of collagen. [[Collagen]] is a protein<ref>[http://folding.stanford.edu/download.html Protein & Folding]</ref> that provides a soft "framework", and [[calcium]] is a mineral that adds strength and hardens the framework. The combination of collagen and calcium makes bone the strongest material in the body. More than 99 percent of the body’s calcium is contained in the bones and [[teeth]]. Most of the remaining 1 percent is found in the [[blood]].

'''Bone''' is living, growing [[tissue]] made mostly of collagen. [[Collagen]] is a protein<ref>[http://folding.stanford.edu/download.html Protein & Folding]</ref> that provides a soft "framework", and [[calcium]] is a mineral that adds strength and hardens the framework.<ref>{{cite book|title=hfg guide to milk|author=Rose Carr|pages=83-84|issn=1176-8746|publisher=Healthy Food}}</ref> The combination of collagen and calcium makes bone the strongest material in the body. More than 99 percent of the body’s calcium is contained in the bones and [[teeth]]. Most of the remaining 1 percent is found in the [[blood]].

==Bone Remodeling==

==Bone Remodeling==

Throughout life, bone is constantly renewed through a three-part process called remodeling. This process consists of reabsorption, collection, and formation. During reabsorption, old bone tissue is broken down and removed by special cells called osteoclasts. During collection, red blood cells bring proteins to the osteoblasts. During bone formation, new bone tissue is laid down to replace the old. Osteoclast and osteoblast function is regulated by several hormones including calcitonin, parathyroid hormone, [[vitamin D]], [[estrogen]] (in women) and [[testosterone]] (in men), among others.

Throughout life, bone is constantly renewed through a three-part process called remodeling. This process consists of reabsorption, collection, and formation. During re[[absorption]], old bone tissue is broken down and removed by special cells called osteoclasts. During collection, red blood cells bring proteins to the osteoblasts. During bone formation, new bone tissue is laid down to replace the old. Osteoclast and osteoblast function is regulated by several hormones including calcitonin, parathyroid hormone, [[vitamin D]], [[estrogen]] (in women) and [[testosterone]] (in men), among others.

==[[Osteoporosis]]==

==[[Osteoporosis]]==