alleryWhy do immune responses become weak in elderly people?
AThymus degenerates, thymosins fall
BAdrenal medulla grows larger
CPineal melatonin output rises
DThyroid stops releasing TCT
Answer & Solution
Correct answer: A. Thymus degenerates, thymosins fall
The thymus shrinks with age, so less thymosin is made and T-cell immunity weakens.
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