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A gland which is well developed in a new-born child that reduces continuously from adulthood to old age is

Option: 1

Parathyroid gland

 


Option: 2

Gonad

 


Option: 3

Thyroid gland

 


Option: 4

Thymus

 


Answers (1)

best_answer

 

  • The thymus gland is a lobular structure located between the lungs behind the sternum on the ventral side of the aorta.
  • It is derived from the endoderm.
  • The thymus plays a major role in the development of the immune system.
  • This gland secretes the peptide hormones called thymosins. 
  • Thymosins play 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 is degenerated in old individuals resulting in a decreased production of thymosins. 
  • As a result, the immune responses of older persons become weak.
  • Hence, the correct answer is option 4.  
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rishi.raj

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