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Last updated 1:14 AM on 10/1/26
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12 Terms

1
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osteoblasts

builds bones

2
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osteoclasts

breakdown bones

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how much is body have calcium

99%

4
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parathyroid hormone

released when blood calcium is low

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how is PTH stimulated

calcium itself signals parathyroid gland to increase PTH secretion

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4 main effects of PTH

increase osteoclast activity, increase intestinal absorption of calcium thru vit D, increase calcium absorption in kidneys, decrease reabsorption of PO43- so calcium can be free

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vitamin d

increases blood calcium - stimulates intestinal absorption of calcium

8
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vitamin d deficiency

decreases calcium absorption from intestines which decreases overall blood calcium; stimulates PTH which breaks down bone

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vitamin d is what of both

vitamin and hormone

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calcitonin

peptide hormone that decreases blood calcium in response to high blood calcium; secreted by parafollicular cells in thyroid glands; may also stimulate osteoblast activity

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what two things increase blood calcium

PTH and vitamin D

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osteoporosis

too much bone breakdown and not enough bone formation

increases fragility and susceptible to fractures