alleryEmphysema is most commonly caused by
Aviral pneumonia in childhood
Bchronic cigarette smoking
Ca single severe asthma attack
Dhigh-altitude residence over months
Answer & Solution
Correct answer: B. chronic cigarette smoking
Emphysema is a chronic obstructive disease in which alveolar walls are destroyed, lowering gas-exchange surface area.
Long-term cigarette smoking is overwhelmingly the leading cause
alpha-1 antitrypsin deficiency is rare.
Vital capacity drops and residual volume rises.
Keep practising Unit 8G: Comparative Physiology: Circulation, Respiration & Gas Exchange
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