in Chemical Coordination and Regulation (Endocrine System) by

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  1. The thymus gland is the primary lymphoid organ.
  2. It is located on the dorsal side of the heart and aorta.
  3. It is a lobular structure.
  4. It secretes the peptide hormone Thymosin which plays a major role in T-cell differentiation, which provides cell-mediated immunity.
  5. It also provides humoral immunity by stimulating antibody production.
  6. In older individuals, the thymus gland degenerates which leads to decreased production of thymosin hormone.
  7. As a result old people have weak immune system and are more susceptible to infectious diseases.