Which hormone is crucial for the maturation of T-cells?

Thymosin is the hormone that plays a crucial role in the maturation of T-cells. It is produced by the thymus gland and is essential for the development and differentiation of T-lymphocytes, which are vital components of the adaptive immune system. These T-cells are responsible for various immune responses, including identifying and destroying pathogens. Thymosin facilitates the maturation process, ensuring that T-cells can effectively recognize and respond to antigens.

Other hormones listed have different functions: insulin primarily regulates glucose metabolism and energy homeostasis, thyroxine influences metabolism and growth but is not directly involved in T-cell maturation, and cortisol is a steroid hormone that helps regulate metabolism and the body's response to stress but does not play a role in T-cell development. Understanding the specific functions of these hormones clarifies why thymosin is the correct answer regarding T-cell maturation.