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The bone salt and collagen fibers together constitute the extracellular matrix of bone tissue. Often the plural form "bone salts" is used; it reflects the notion of various salts that, on the level of molecular metabolism, can go into the formation of the hydroxyapatite. Bone mineral is dynamic in living animals; it is continually being ...
Mineral storage – bones act as reserves of minerals important for the body, most notably calcium and phosphorus. [ 58 ] [ 59 ] [ 60 ] Determined by the species, age, and the type of bone, bone cells make up to 15 percent of the bone.
Up to 50% by volume and 70% by weight of human bone is a modified form of hydroxyapatite, known as bone mineral. [7] Carbonated calcium-deficient hydroxyapatite is the main mineral of which dental enamel and dentin are composed.
This can be done in terms of the chemical elements present, or by molecular structure e.g., water, protein, fats (or lipids), hydroxyapatite (in bones), carbohydrates (such as glycogen and glucose) and DNA. In terms of tissue type, the body may be analyzed into water, fat, connective tissue, muscle, bone, etc.
Several hypotheses have been proposed for how bone evolved as a structural element in vertebrates. One hypothesis is that bone developed from tissues that evolved to store minerals. Specifically, calcium-based minerals were stored in cartilage and bone was an exaptation development from this calcified cartilage. [5]
Oxygen, hydrogen, carbon and nitrogen are the most abundant elements in the body by weight and make up about 96% of the weight of a human body. Calcium makes up 920 to 1200 grams of adult body weight, with 99% of it contained in bones and teeth.
This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties.
In bone for example, the organic layer is the protein collagen. [3] The degree of mineral in mineralized tissues varies and the organic component occupies a smaller volume as tissue hardness increases. [1] [18] However, without this organic portion, the biological material would be brittle and break easily.
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