LYCOS RETRIEVER 
Bones: Calcium
built 605 days ago
Vitamin D plays an important role in building and maintaining healthy bones by promoting calcium absorption. Suboptimal levels of vitamin D are associated with reduced calcium absorption, bone loss and an increased risk for osteoporosis -- a condition characterized by low bone mass, bone fragility and susceptibility to fractures, especially of the hip and spine. In fact, the first-ever Bone Health and Osteoporosis: A Report of the Surgeon General (2004) listed vitamin D, along with calcium and physical activity, as the three key elements to maintaining optimal bone health. Based on relevant clinical practice experience and involvement in various research that highlights the role of vitamin D in bone health, the panel concluded that it is of paramount importance that vitamin D be considered in patients being treated for osteoporosis and other bone diseases.
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Osteoblasts make and secrete the protein collagen, which makes bones elastic so that they can give under the stresses generated by walking, lifting, and other activities. Osteoblasts ... secrete mineral salts formed from calcium and phosphorus, which impart hardness so that bones do not break easily. If more bone is needed, new osteoblasts carry out the task of building it. As bone tissue matures, osteoblasts transform into osteocytes, mature bone cells that carry out daily cellular activities.
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A baby's body has about 300 bones at birth. These eventually fuse (grow together) to form the 206 bones that adults have. Some of a baby's bones are made entirely of a special material called cartilage (say: car-til-ij). Other bones in a baby are partly made of cartilage. This cartilage is soft and flexible. During childhood, as you are growing, the cartilage grows and is slowly replaced by bone, with help from calcium.
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Strong bones need both calcium and weight-bearing physical activity. It's not enough to just eat right or just do lots of weight-bearing physical activity. It takes both to make bones strong. So jump to it, girlfriend!
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According to an article in the February issue of Pediatrics, milk may not be the best calcium source to help kids build strong bones. That message flies in the face of countless studies completed over the years that link dairy consumption with building strong bones.
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A bone mineral density (BMD) test measures the density of minerals (such as calcium) in your bones using a special X-ray, computed tomography (CT) scan, or ultrasound. This information is used to estimate the strength of your bones.
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Calcium