Calcitonin vs. Parathyroid Hormone - PBSci 7
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13 Terms
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Calcitonin
Secreted by the parafollicular (C cells) of the thyroid gland
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Parathyroid hormone
Secreted by the chief cells of the parathyroid glands
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Calcitonin
Primary target organ is bone
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Parathyroid hormone
Target organs include bone, kidney, and indirectly the intestine
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Calcitonin
Inhibits osteoclast activity to decrease bone resorption
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Parathyroid hormone
Stimulates osteoclast activity to increase bone resorption
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Calcitonin
Lowers plasma calcium levels by promoting deposition in bone
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Parathyroid hormone
Raises plasma calcium levels by mobilizing it from bone
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Calcitonin
Has a minor effect of lowering plasma phosphate
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Parathyroid hormone
Lowers plasma phosphate by inhibiting its renal reabsorption
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Parathyroid hormone
Increases intestinal absorption of calcium and phosphate via vitamin D activation
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Calcitonin
Has the overall function of lowering blood calcium, remembered by "Calci-tone it down"
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Parathyroid hormone
Has the overall function of raising blood calcium, remembered by "Pulls The calcium High"
Note 
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