Calcium Homeostasis - Calcium Homeostasis Hormones...

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Calcium Homeostasis 20/02/2008 10:12:00 Hormones Calcitonin o Synthesized in thyroid gland (Add Notes) Parathyroid hormone o Stimulated by low blood calcium o Synthesized in parathyroid gland o Targets Bone Stimulate osteoclast activity Kidney Decrease kidney action Intestine Stimulates intestinal absorption Promotes vitamin D action o Increases calcium Vitamin D  Active form-Calcitriol o Steroid hormone o Lipid soluble
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Only absorbed in the presence of fat Absorbed in intestine o Derived from cholesterol Vitamin D pathway Found in the skin Inactive form 7-dehydrocholesterol Becomes vitamin D-3 (Colicalciferol) in the presence of  UV light Dietary Vitamin D-3 o Fish oil o Egg yolk o Fortified milk Incidental sun exposure in Tucson is sufficient for  absorption o No so in Seattle… o Elderly individuals may be deficient due to  lack of sun exposure
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Calcium Homeostasis - Calcium Homeostasis Hormones...

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