In emphysema, breakdown of alveoli reduces surface area and increases diffusion distance, while loss of elastin hinders lung recoil. This leads to inefficient gas exchange, reduced oxygen supply, and feelings of weakness and tiredness caused by reduced oxygen delivery to tissues.
In emphysema, breakdown of alveoli reduces surface area and increases diffusion distance, while loss of elastin hinders lung recoil. This leads to inefficient gas exchange, reduced oxygen supply, and feelings of weakness andcaused by reduced oxygen delivery to tissues.
| Front | Emphysema is another disease of the lungs. People with emphysema may feel weak and tired. Explain why. ( 5 marks) |
|---|---|
| Back | 1 Alveoli break down/collapse/rupture/walls thicken; 2 Less surface area/increases diffusion distance/less diffusion; 3 Loss of elastin/elastic tissue/elastase involved; 4 (Alveoli/lungs) cannot recoil/spring back/have reduced elasticity/more difficult to expel air; 5 Reduced diffusion gradient/air not replenished/less air leaves lungs; |
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