What is the primary function of human growth hormone?

The primary function of human growth hormone (HGH) is to promote growth and development in various tissues throughout the body. It plays a crucial role in stimulating growth and cell reproduction, particularly during childhood and adolescence. HGH influences the growth of bones and cartilage, ensuring that individuals attain proper height and develop muscle strength. Additionally, it helps regulate metabolism by influencing how the body uses fats, proteins, and carbohydrates.

The other options involve activities related to different hormones or physiological processes. Thyroid hormone release is primarily regulated by thyroid-stimulating hormone (TSH), and water reabsorption is mainly managed by antidiuretic hormone (ADH). Milk production is stimulated by prolactin, which is distinct from the action of growth hormone. These functions highlight the unique role of human growth hormone in human development and metabolism, making it essential for growth.