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Sulphur dioxide affects the respiratory system principally as

  • A.An asphyxiant that displaces oxygen
  • B.A carcinogen acting on the alveoli
  • C.A neurotoxin
  • D.A soluble upper airway irritant

Answer: D

Its high solubility means most of it is taken up before it reaches the deep lung, so bronchial constriction rather than alveolar damage is the characteristic effect. Asthmatics respond at concentrations that healthy people would scarcely notice at all.

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