The 'Hormone Thymosin' is secreted by the thymus gland and plays a crucial role in the immune system by: MCQ with Answer and Explanation

Thymosin is a group of peptide hormones secreted by the epithelial cells of the thymus gland. The thymus is the primary site for the maturation of T-lymphocytes (T cells), which are essential for cell-mediated immunity. Thymosin plays a critical role in this process by promoting the differentiation, development, and maturation of immature T cells (thymocytes) into functional, immunocompetent T cells. As the thymus involutes (shrinks) after puberty, thymosin levels decline.