Bone hormones and reg

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9 Terms

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blood calcium regulation hormones

PTH and calcitriol

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PTH

released by parathyroid glands when blood Ca2+ is low

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3 targets

  1. increased absorption of ca2t from small intestine into blood.

  2. Osteoclasts activation releasing Ca2+ from bone

  3. Increased reabsorption Ca2+ from kidney.




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Calcitonin

Released when Ca2+ is high and response to stress

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What does calcitonin inhibit and increase?

Inhibits osteoclasts, increase osteoblasts

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What does calcitonin stimulate

Stimulates kidney to increase Ca2+ excretion

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Calcitriol

Active form of vitamin D, increases calcium absorption.

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PTH & Calcitriol interact with bone

increase release of CA 2+ from bone by increasing osteoclast activity.


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PTH & Calcitriol interact with kidney

stimulate kidney to excrete less Ca 2+ in the urine.