AIIMS2007ZoologyBreathing and Exchange of Gases
Which of the following match is correct?
Options
- AEmphysema : reduction of surface area of alveoli and bronchi
- BPneumonia : occupational disease with asbestos
- CSilicosis : inflammation of alveoli
- DAsthma : excessive secretion of bronchial mucus
Correct answer
A. Emphysema : reduction of surface area of alveoli and bronchi
Step-by-step solution
Emphysema means abnormal accumulation of air in the tissues (lungs). In pulmonary emphysema the air sacs (alveoli) of the lungs are enlarged and damaged, which reduces the surface area for the exchange of oxygen and carbon dioxide. Severe emphysema causes breath-lessness, which is made worse by infections. Pneumonia is inflammation of the lung caused by bacteria, in which the air sacs (alveoli) become filled with inflammatory cells and the lung becomes solid. The symptoms include those of any infection (fever, mala