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Why do old persons have weaker immune responses?
AThymus degenerates, so less thymosin
BThe thyroid gland enlarges
CPineal secretes more melatonin
DAdrenal medulla shrinks fast
Answer & Solution
Correct answer: A. Thymus degenerates, so less thymosin
Thymus degeneration with age lowers thymosin production, weakening immune responses.
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