What is the primary function of growth hormone?

The primary function of growth hormone is to stimulate growth, cell reproduction, and cell regeneration, which is reflected in the correct answer. Growth hormone, produced by the anterior pituitary gland, plays a crucial role in promoting linear growth during childhood and adolescence by stimulating the growth of bone and cartilage. Additionally, it contributes to tissue repair and regeneration in adults, influencing muscle mass and overall body composition.

The other functions listed in the other options do not encapsulate the core purpose of growth hormone. While some hormones may participate in digestion and metabolism, regulate blood glucose levels, or enhance immune responses, these activities are not the primary responsibilities of growth hormone. Its main role is distinctly associated with growth and cellular processes, making the second choice the most accurate representation of its primary function.