Question

Of the following nutrients, the one essential for absorption of calcium and phosphate ions in the digestive tract is:

1) Vitamin D
2) Vitamin C
3) Iron
4) Magnesium

Answer 1

Vitamin D is essential for the absorption of calcium and phosphate in the digestive tract, aiding in bone health and preventing disorders like osteoporosis and rickets. The option (1) is correct.

Step-by-step explanation:

The nutrient essential for the absorption of calcium and phosphate ions in the digestive tract is Vitamin D. This vitamin enhances the absorption of calcium by promoting the synthesis of a specific calcium-binding protein necessary for the active transport of calcium across the small intestinal mucosa.

Adequate levels of Vitamin D are critical to bone health not only because they help absorb calcium but also because they play a role in bone remodeling. Factors such as acidity, the presence of organic acids, lactose, and Vitamin D influence the amount of calcium absorbed from the diet. Conversely, a deficiency of Vitamin D can lead to decreased calcium absorption and result in bone disorders such as rickets in children and osteoporosis in adults. Therefore, option (1) is correct.