Ch. 11 Calcium Homeostasis

Calcium in and out of bone is important for

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calcium in and out of bone is important for controlling plasma Ca 2+ concentration; the kidneys filter blood to eliminate waste. Urinary excretion of Ca 2+ is the difference between the amount filtered into the tubules and the amount recaptured and returned to the blood (reabsorbed). The control of Ca 2+ excretion in urine is exerted mainly on reabsorption. Reabsorption decreases when plasma Ca 2+ increases, and it increases when plasma Ca 2+ decreases. The gastrointestinal tract… A considerable amount of ingested calcium is NOT absorbed from small intestine and leaves body through feces. Moreover, the active transport system that achieves Ca 2+ absorption from the small intestine is under hormonal control . So large regulated increases or decreases can occur in the amount of Ca 2+ absorbed from the diet. (Hormonal control of this absorptive process is the major means for regulating total-body calcium balance!!!) 2. What is bone remodeling? When does it occur and what factors influence it? (Sect11F.1, Fig11.29) Bone remodeling is the process of osteoblasts and osteoclasts working together.
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