BIOC34H3 Lecture Notes - Lecture 18: Renal Function, Cholecalciferol, Homeostasis

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20 Apr 2014
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Lecture 18: calcium regulation, glucose regulation and clearance: calcium regulation. Calcium levels in the blood are regulated primarily by hormones. Calcium exchange occurs between the blood and the following calcium stores or reservoirs; bone, the gut and the kidney. We can absorb calcium from digested food in the gut or reabsorb it from the kidney (it was filtered in the first place). The rates of absorption from the gut or reabsorption from the kidneys can be regulated depending upon whether plasma calcium levels are high or low. We can take calcium from the bones and add it to the blood or deposit it from the blood back into the bone. Calcium removal from the bone is referred resorption whereas when calcium is deposited into the bones it is referred to as calcification or deposition. There are three primary hormones involved in these process: parathyroid hormone and calcitrol (both involved in raising plasma calcium levels), and calcitonin (involved in lowering them).

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