Answer:
Emphysema is a chronic
disorder of respiratory system, where inflation or abnormal distension of
alveolar wall occurs. Cigarette smoking and the inhalation of other smoke or toxic
substances over a period of time causes the damaging of septa between the
alveoli, and of its elastic tissue is replaced by the connective tissue in
lungs.
Hence, the respiratory
surface decreases, thus causing the emphysema. It causes shortness of breath,
production of sputum, chronic bronchitis, etc.
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