NCLEX Nutrition Practice Exam

Amino acids play a critical role in muscle building, which is why the selected answer is correct. They are the building blocks of proteins, which are essential for the growth and repair of tissues, including muscles. When you engage in physical activities or strength training, the body requires amino acids to synthesize new muscle proteins and repair any damage caused during exercise. This process helps in building muscle mass and improving overall physical performance.

In addition to muscle building, amino acids contribute to various other functions in the body, such as hormone production, immune system support, and the synthesis of neurotransmitters. However, the specific role highlighted in the question emphasizes the importance of amino acids in muscle development and maintenance, particularly in response to physical demands.

The other options presented focus on different physiological functions that amino acids do not directly serve. Energy storage relates more to carbohydrates and fats, fat metabolism involves different biochemical pathways that primarily utilize lipids, and mineral absorption is largely associated with vitamins and digestive health rather than the direct action of amino acids.