To discuss:
Effects of dietary vitamins A, C, and D on bone
Introduction:
Mineralization is a process (crystallization) that deposits phosphate, calcium, and other ions (from blood plasma) in the tissues of the bone as hydroxyapatite. This process is initiated by the osteoblast by laying collagen fibers on the surface of the osteon. These fibers are coated with minerals that make the matrix hard. Only if the concentration of the products (of above minerals) in the plasma reaches the critical value (solubility product), the hydroxyapatite is formed. Sometimes, calcification is repressed by some inhibitors found in the tissue. This inhibitor is deactivated by osteoblast, and it enables the precipitation of the salt in the matrix of the bone. The initially formed crystals perform like a “seed of crystals” that attract more phosphate and calcium from the plasma.
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Anatomy and Physiology
- During the early years of space exploration our astronauts, who had been floating in space, would return to earth showing significant bone loss dependent on how long they were in space. Discuss how this might happen and what could be done to alleviate this condition.arrow_forwardCalcium is one of the minerals suggested to be included in our daily intake from the time we were born until we grow older. Explain the role of calcium in bone function, and the role of the bone in calcium homeostasis.arrow_forwardCalcium intake and bone mineral densityarrow_forward
- In the histological study of diaphysis of the tubular bone: there are basophilic cells with synthesized synthesis organelles on the it surface under the fiber layer. These cells are involved in the regeneration of bone tissue. In what layer of diaphyseal are they located? * Periosteum O Layer of internal lamellas O Layer of external lamellas Bone matrix Osteogenic layerarrow_forwardCalcium carbonate accounts ...% of inorganic material of matrix of osseous tissuearrow_forwardthe outer most layer of bone is calledarrow_forward
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