in Chemical Coordination and Regulation (Endocrine System) by

1 Answer

0 votes
  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.
Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.