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Question

Parathormone influences calcium absorption in the small intestine by regulating the metabolism of:

A
Vitamin B6
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B
Vitamin D
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C
Enterogastrone
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D
Vitamin C
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Solution

The correct option is B Vitamin D
The parathyroid glands secrete a peptide hormone called parathyroid hormone (PTH). The secretion of PTH is regulated by the circulating levels of calcium ions.
PTH is a hypercalcemic hormone. It increases calcium absorption in small intestine by regulating metabolism of vitamin D by stimulating osteoclasts. These are the cells that cause breakdown by dissolution of calcium from bone and thus, concentration of calcium is increased in blood. Therefore, PTH increases Ca2+ levels in the blood, absorption in the bone and increases its absorption in digested food.

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