Asthma is due to:
Elasticity of lungs is reduced
Degradation of alveolar wall
Bronchioles constrict due to muscle spasms
Damage in diaphragm
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 Ans.