During old age, the immunity of a person begins to decrease and as a result, they become more susceptible to infections and diseases. What could be the probable reason for this?

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The thymus gland is responsible for the secretion of thymosins which play a major role in the differentiation of T-lymphocytes and provide cellular immunity. They also promote antibody production and provide humoral immunity. Hence, degeneration of the thymus gland in old age leads to decreased immunity.

Zoology - Human Health and Diseases Question with Solution | TestHub

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