Question

The main function of vitamin D is to promote​a.​

a. calcium and phosphorus absorption, and calcium mobilization from bone.
b.​synthesis of carotenoids and controls absorption of fat-soluble vitamins.
c.​conversion of calcium and phosphorus to more readily absorbable compounds.
d.​secretion of calcitonin. e.​synthesis of dehydrocholesterol.

Answer 1

a. calcium and phosphorus absorption, and calcium mobilization from bone.

Step-by-step explanation:

Vitamin D is a fat soluble vitamin. It is present in very few foods and also synthesized when skin is exposed to sun's ultra violet rays. In humans, the most important forms of Vitamin D are D3 and D2.

It plays an important role in maintaining the required level of calcium and phosphorus in blood by many ways:

• It acts on intestinal epithelial cells to increase the absorption of calcium and phosphorous from digested food.
• It also enhances calcium mobilization from bone which means calcium is released from the bones to maintain blood calcium level.
• It also enhances tubular re absorption of calcium in kidneys.