Mature living bone cells
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Endochondral ossification is the process of bone development from hyaline cartilage. Mature bone cells called what maintain bone in a viable state. What is the mature bone cell called. The neck of the femur must be strong enough to transfer the downward force of the body weight horizontally to the vertical shaft of the femur. Differences in turnover rates exist in different areas of the skeleton and in different areas of a bone. Normal bone growth requires vitamins D, C, and A, plus minerals such as calcium, phosphorous, and magnesium.
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Cellular Structure Of Bone
Appositional growth is the process by which old bone that lines the medullary cavity is reabsorbed and new bone tissue is grown beneath the periosteum, increasing bone diameter. The newly-deposited bone tissue at the top of the zone of ossification is called the primary spongiosa. The osteoblast, the bone cell responsible for forming new bone, is found in the growing portions of bone, including the periosteum and endosteum. Bone remodeling allows bones to adapt to stresses by becoming thicker and stronger when subjected to stress. Bone turnover rates, the rates at which old bone is replaced by new bone, are quite high, with five to seven percent of bone mass being recycled every week.
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Birth and death of bone cells
Proper bone growth and maintenance requires many vitamins D, C, and A , minerals calcium, phosphorous, and magnesium , and hormones parathyroid hormone, growth hormone, and calcitonin. As a bone matures, the epiphyseal plate progresses to an epiphyseal line. Bones can grow in thickness throughout life, but after age 25, ossification functions primarily in bone remodeling and repair. Osteoclasts, cells that work to break down bone, resorb old bone that lines the medullary cavity. This illustration shows the zones bordering the epiphyseal plate of the epiphysis. The dynamic nature of bone means that new tissue is constantly formed, while old, injured, or unnecessary bone is dissolved for repair or for calcium release. The inner layer of bones consists of spongy bone tissue.
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