What is the primary function of Vitamin D in the body?

• A. It regulates blood pressure
• B. It is needed to absorb calcium
• C. It promotes muscle growth
• D. It increases fat metabolism

Answer: (B)

The primary function of Vitamin D in the body is to facilitate the absorption of calcium from the diet into the bloodstream. Calcium is crucial for various physiological functions, including the maintenance of bone density and health. Without adequate Vitamin D, the body cannot efficiently absorb calcium, which can lead to weakened bones and conditions such as osteomalacia or osteoporosis.

Vitamin D works in conjunction with parathyroid hormone to regulate calcium levels in the blood and ensure that sufficient amounts are available for bone mineralization. This is particularly important in the context of bone densitometry, where maintaining adequate calcium levels is essential for bone health and preventing bone-related diseases.

In contrast to the other functions listed, while Vitamin D may play a role in various bodily processes, its most critical and well-established role is in calcium absorption.