BPK 110 Lecture Notes - Bone Resorption, Dietary Fiber, Chard

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Hardened by minerals mostly calcium, phosphorus, also magnesium, sodium, fluoride, other minerals. Vitamin d to maintain calcium and phosphorus levels. Bone is always remodelling-breaking down and building up. When blood ca2+ levels are low, cells called osteoclasts promote bone resorption (break down of bone to release ca2+) When blood ca2+ levels are high, cells called osteoblasts promote bone formation. Bone formation > bone resporption = net building bone. Bone resorption > bone formation = net bone loss. Peak bone mass-the maximum bone density attained at any time in life. Until age 30, you have a limited time to build up bone mass. Especially women, especially after menopause due to drop in estrogen. Weight-bearing activity, calcium, vitamin d important to prevent osteoporosis. Osteoporosis-a bone disorder characterized by reduced bone mass. Risks associated with level of peak bone mass and rate at which bone is lost. Affected by genetics, gender, age, hormones, low body weight, and lifestyle (smoking, alcohol, exercise, diet)

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