Thymus Gland and Immune Development — NEET Biology
📚 Practice ConceptThe thymus gland is a lobular structure located between lungs behind sternum on the ventral side of aorta. The thymus plays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cell-mediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
Which of the following statements concerning the thymus gland and its hormones are correct? S1: The thymus gland is a lobular structure located between the lungs behind the sternum on the ventral side of the aorta. S2: Thymosins are peptide hormones secreted by the thymus gland that promote the differentiation of T-lymphocytes. S3: T-lymphocytes are primarily responsible for providing humoral immunity by producing antibodies. S4: The immune responses of old persons typically become stronger due to the continued activity of the thymus throughout life. S5: Thymosins also enhance the production of antibodies, thereby contributing to humoral immunity.
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