22.2.6 Thymus

The thymus gland is a lobular structure located on the dorsal side of the heart and the 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 Tlymphocytes, 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.

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