National League for Nursing (NLN) Science Practice Exam

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How does vitamin D assist in the growth and development of bone?

Help excrete excess salt
Control sulfur and calcium levels in the blood
Aid in the absorption of calcium
Regulate levels of chloride ion

The correct answer is: Aid in the absorption of calcium

Vitamin D plays a crucial role in the growth and development of bone primarily through its function in aiding the absorption of calcium in the intestines. Calcium is a vital mineral necessary for the formation and maintenance of healthy bone tissue. When vitamin D is present, it ensures that the intestines efficiently absorb calcium from the diet, which is then available for use in bone mineralization. This process is essential during periods of growth, such as childhood and adolescence, as well as for maintaining bone density in adults and the elderly. While other elements mentioned, such as sodium, sulfur, and chloride have their own biological significance, they do not directly relate to bone health in the same fundamental way that calcium does with the involvement of vitamin D. Thus, the role of vitamin D in facilitating calcium absorption is critical for optimal bone health and development.