Ramesh's grandfather falls ill repeatedly due to infections. The doctor says it's because his immunity is lowered owing to his old age. Which of the following is likely to be affected?

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Thymus gland secretes hormones called thymosins. Thymosins play a major role in the differentiation of T lymphocytes, which provide cell-mediated immunity and 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.

Zoology - Human Health and Diseases Question with Solution | TestHub

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