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9 Cards in this Set
- Front
- Back
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What is the major source of Vitamin D?
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D3 from sun exposure to the skin
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What is the other source of Vitamin D?
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D2 ingested from plants
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What is the mechanism of conversion of Vitamin D after being absorbed on the skin?
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Converted to 25-OH in the liver and then converted to 1,25 OH2 in the kidney
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What is the inactive form of Vitamin D?
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24,25 OH2 D3
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What are the 2 functions of Vitamin D?
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Increase absorption of dietary Ca and PO4
Increase bone resorption of Ca and PO4 |
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What feedback mechanism inhibits 1,25 OH2 production?
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1,25 OH2 feedback from increased serum levels
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Where is Calcitonin created?
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Parafolliculat cells (c cells) of thyroid
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What is the function of Calcitonin?
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Decreased bone resorption of calcium
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What regulation mechanism causes calcitonin secretion?
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Increase in serum calcium = calcitonin increase
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