Chemical Coordination and Regulation Question 55
55. According to the “immunity theory” of ageing, the process starts with the gradual atrophy and disappearance of
(a) thyroid
(b) parthyroid
(c) thymus
(d) islets of Langerhans
Show Answer
Answer : c
Hints & Solutions
(c) According to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.
