Question

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

• A. Vitamin C
• B. Vitamin D
• C. Vitamin $B_6$
• D. Enterogasterone

Answer 1

The correct option is B Vitamin D

The kidney processes Vitamin D into calcitriol, the active form that is most effective in assisting intestinal absorption. This process is stimulated by parathyroid hormone. Vitamin D is an important co-factor in the intestinal absorption of calcium, as it increases the number of calcium binding proteins, involved in calcium absorption through the apical membrane of enterocytes in the small intestine.