Class 11 Biology Chemical Coordination THYMUS


  • Lobular structure located between lungs behind sternum on the ventral side of aorta.
  • It helps in development of immune system.
  • It secretes peptide hormone called thymosins (which plays major role in differentiation of T-lymphocytes and provide cell-mediated immunity).
  • Thymus is degenerated in old individuals resulting in a decreased production of thymosins due to which immune response becomes weak.

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