What is the role of zinc in the human body?

Zinc plays a vital role in supporting immune function, which is why that choice is the correct answer. It is an essential trace element that significantly contributes to the development and function of immune cells. Zinc influences various aspects of immune response, including the development of T-lymphocytes and the activity of phagocytes, which are crucial for targeting and eliminating pathogens. A deficiency in zinc can lead to impaired immune responses, increased susceptibility to infections, and slower wound healing.

While energy production, protein synthesis, and bone density regulation are important processes in the body, they are not primarily attributed to zinc's role. Energy production is mostly facilitated by macronutrients such as carbohydrates, fats, and proteins. Protein synthesis involves multiple other amino acids and factors, and while zinc does play a role in enzyme function related to proteins, its direct involvement in immune function is more critical. Bone density regulation involves minerals such as calcium and vitamin D, alongside a variety of hormones and physiological factors, distinguishing it from the specific role zinc plays in supporting the immune system.