Question

Which of the following hormone controls the biological clock of ageing?

• A. Thymosin
• B. Insulin
• C. Pancreas
• D. None of the above

Answer 1

The correct option is A Thymosin

• The thymus gland secretes a peptide hormone called Thymosin. Thymosin plays a major role in the differentiation of T-lymphocytes, which provide cell-mediated immunity. In addition, thymosins also promote the production of antibodies to provide humoral immunity.
• The thymus gland is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
• Hence Thymosin hormone controls the biological clock of ageing by promoting immunity in adult and by degeneration in older individuals.
  
• So, the correct answer is 'Thymosin'.