PHGY 210 Lecture Notes - Breastfeeding, Mifepristone, Amenorrhoea
6 May 2013
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Document Summary
Release of hormones and neurotransmitters. With na+ and k+ helps maintain transmembrane potential of cells. Calcium is important in excitability of nervous tissue. Contraction of muscles: concentration in cellular and extracellular fluid is ~ 10 mg/100ml. In circulation 50% free, 50% bound to albumin: ~99% of body calcium is in skeleton/bone. Three particularly important hormones: parathyroid hormone (pth): a protein produced by parathyroid glands. It lowers the circulating levels of calcium: anti- parathyroid hormone , vitamin d: a steroid. It increases the circulating levels of calcium. The calcium cycle: calcium is obtained in the diet from milk, cheese, eggs, butter, etc. It is absorbed form the digestive tract in the duodenum and upper jejunum of the intestine. Pth: calcium circulating in plasma, some calcium will be deposited in bone or cells of other tissues. Calcitonin increases deposition in bone: some will go through the kidney and be excreted in the urine. Intestinal ca++ absorption is increased by vit d and.
