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Question

Parathormone is involved in calcium balance in the body. Which of the following organs does it act on?


A

Bones

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B

Kidneys

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C

Gastrointestinal tract

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D

All the above

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Solution

The correct option is D

All the above


Parathyroid hormone (PTH) increases the Ca++ levels in the blood. PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation). PTH also stimulates reabsorption of Ca++ by the renal tubules and increases Ca++ absorption from food in the intestine. It is, thus, clear that PTH is a hypercalcemic hormone, i.e., it increases the blood Ca++ levels.


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