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Incidence of emphysema, a respiratory disorder is high in cigarette smokers. In emphysema,
  1. the bronchioles are found to be damaged
  2. the alveolar walls are found to be damaged
  3. the bronchi are found to be damaged
  4. the respiratory muscles are found to be damaged


Solution

The correct option is B the alveolar walls are found to be damaged
Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. It is a respiratory disorder caused majorly by cigarette smoking. Also, inhalation of other smoke or toxic substances over a period of time can cause this disorder.

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