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11 Cards in this Set
- Front
- Back
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Where is parathyroid gland located in reptiles
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medial surface of mandibular rami
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What cells secrete PTH
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chief cells
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What hormones are involved with calcium homeostasis
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PTH, Vitamin D3, calcitonin
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What are the 2 forms of calcium
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ionized
protein bound |
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Which form stimulates PTH
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decrease in ionized calcium
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where is calcium reabsorbed from?
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bones, kidneys, intestines
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PTH effect on Kidneys
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increased tubular reabsorption--> decreased calcium excreted in urine
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PTH on Bones
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PTH interacts with receptors on osteoblasts--> osteoblasts contract--> exposes underlying bone to osteoclasts-->increases osteoclast bone resorption--> increased calcium release
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PTH on intestines
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(indirect method) PTH promotes Ca2+ absorption from GI tract
- requires renal synthesis of vit D |
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How is calcium stored in body
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99%- hydroxyapatite inorganic matrix of bone
0.99% plasma membrane & endoplasmic reticulum 0.1% extracellular fluid |
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2 main functions of calcium
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1. maintain structural integrity of bone
2. messenger/regulatory ion |
