Why does immunity in old people decrease?

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Question

(B) The thymus gland is a primary lymphoid organ that plays a crucial role in the development of the immune system. In old individuals,the thymus glan

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Due to the degeneration of the thymus gland.

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(B) The thymus gland is a primary lymphoid organ that plays a crucial role in the development of the immune system. In old individuals,the thymus gland undergoes gradual degeneration (atrophy),which leads to a significant decrease in the production of thymosins. Thymosins are peptide hormones essential for the differentiation of $T$-lymphocytes,which provide cell-mediated immunity. Consequently,the reduction in thymosin levels results in a weakened immune response in elderly people.

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