Question

Vitamin d regulates the absorption of ______ from the small intestine. calcium and fluoride phosphorus and magnesium calcium and magnesium calcium and phosphorus

Answer 1

Vitamin D is crucial for the absorption of calcium and phosphorus from the small intestine. It facilitates the intake of these minerals, which are key to bone health and the prevention of skeletal diseases like rickets and osteomalacia.

Step-by-step explanation:

Vitamin D regulates the absorption of calcium and phosphorus from the small intestine. It is essential for bone health because it promotes the synthesis of a specific calcium-binding protein, which is involved in the active transport of calcium across the small intestinal mucosa. Moreover, vitamin D facilitates the intestinal absorption of calcium and phosphorus, which are vital components of bone in the form of calcium phosphate and calcium carbonate.

Without adequate vitamin D, the body cannot effectively absorb calcium from the diet, leading to potential skeletal problems such as rickets in children and osteomalacia in adults, which may contribute to osteoporosis.

Thus, sufficient intake of vitamin D is critical not only for the absorption of calcium but also for maintaining normal calcium concentration in the blood and for the process of bone remodeling.

Answer 2

The answer is calcium. Vitamin D increases absorption of calcium in the small intestines. 1,25Dihydroxyvitamin D3 (1,25(OH)2D3), which is the hormonally active form of vitamin D, is responsible for influencing the active absorption of calcium in the intestines. Active form involves transcellular pathways.