What does Growth Hormone (GH) primarily stimulate?

Growth Hormone (GH) primarily plays a crucial role in stimulating growth and regulating metabolic functions. It exerts its effects by promoting the growth of tissues and organs, particularly during childhood and adolescence, when growth is at its peak. Growth Hormone encourages the proliferation of cells, particularly in bones and muscles, thereby facilitating physical growth.

In addition to its role in growth, GH also influences metabolic processes. It enhances lipolysis, the breakdown of fats, leading to increased energy availability. Moreover, GH has a significant impact on carbohydrate metabolism, reducing glucose uptake by tissues and thereby increasing blood glucose levels when necessary. This dual function of promoting growth while also regulating metabolic processes such as fat utilization and glucose production showcases the hormone's vital role in maintaining overall homeostasis in the body.

While other options mention functions related to glucose production, fat storage, and immune response, these do not encapsulate the primary role of GH as effectively as the correct answer does. The principal focus on growth and metabolic functions highlights why this option is the most appropriate choice in relation to the primary stimulation function of Growth Hormone.