question_answer 23)

  Incidence of emphysema a respiratory disorder is high in cigarette smokers. In such cases (a) the bronchioles are found damaged (b) the alveolar walls are found damaged (c) the plasma membrane is found damaged (d) the respiratory muscles are found damaged

Answer:

                  (b) Emphysema is a chronic disorder in which alveolar walls are damaged due to the infection or obsomal distersion. It is a respiratory disorder caused by cigarette smoking and inhalation of other smoke or toixic substances over a period of time.