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Physiology

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Endocrinology

Question
4 out of 14
 

A patient is on a Low calcium diet for 6 weeks. He is most likely to have:



A Raised parathyroid hormone levels            

B Raised calcitonin levels

C Increased phosphate levels                          

D None of the above

Ans. A Raised parathyroid hormone levels

I. Circulating ionized calcium acts directly on the parathyroid glands in a negative feedback fashion to regulate the secretion of PTH.

II. The key to this regulation is a cell membrane Ca2+ receptor.

III. This serpentine receptor is coupled via a G protein to phosphoinositide turnover and is found in many tissues.

IV. In the parathyroid its its activation inhibits PTH secretion is habited and the Ca2+ is deposited in the bones.

V. When it is low, secretion is increased and Ca2+is mobilized from the bones.

Endocrinology Flashcard List

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