Q:

Parathormone

safaTerkawi
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2022-08-14
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Parathormone.

  1. Secretion is regulated by a pituitary feedback control system.
  2. Acts directly on bone to increase bone resorption.
  3. Decreases the urinary output of calcium.
  4. Decreases phosphate excretion.
  5. Promotes absorption of calcium from the intestines.
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safaTerkawi
2022-08-14
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A. False It is regulated directly by the calcium level in the blood that perfuses it.

B. True It stimulates osteoclasts to resorb bone; excessive secretion causes cysts to form.

C. False The high blood calcium levels with parathormone and the resulting increase in calcium filtration in the glomeruli result in an increased calcium output in urine.

D. False It increases phosphate excretion by reducing renal phosphate reabsorption.

E. True It does this indirectly by stimulating 1,25-dihydroxycholecalciferol production.

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