SKELETAL SYSTEM (CALCITONIN AND PTH), LECTURE EXAM)

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4 Terms

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Parathyroid Hormone (PTH)

•Secreted by the parathyroid gland

•Increases formation and activation of osteoclasts, the principal bone-reabsorbing cells

•Stimulates reabsorption of Ca2+ from urine in the kidney, reducing the amount of Ca2+ excreted in the urine.

•Indirectly increases Ca2+ uptake from the small intestine through the activation of calcitriol.

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Calcitonin

•Secreted from C cells in the thyroid gland when blood Ca2+ levels are too high

•Rapidly lowers blood Ca2+ levels by inhibiting osteoclast activity

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