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Alveoli Reduced Diffusion Elastin Emphysema Reduces Efficiency Gas

Emphysema reduces gas exchange efficiency as alveoli break down, decreasing surface area and increasing diffusion distance. Loss of elasticity hinders lung recoil, reducing airflow and maintaining a smaller diffusion gradient.

Emphysema reduces gas exchange efficiency as alveoli break down, decreasing surface area and increasing diffusion distance. Loss of elasticity hinders lung recoil, reducing airflow and maintaining a smaller diffusion gradient.

Front Emphysema reduces the efficiency of gas exchange in the lungs. Explain why. ( 4 marks)
Back 1. Alveoli break down / collapse / rupture / fewer alveoli / larger alveoli or alveolar wall/epithelium walls thicken; 
2. Reduced surface area / increased diffusion pathway; 
3. (So) less diffusion; 
4. Less elastin / elastic (tissue) / not recoiling / loss of elasticity / elastin permanently stretched; 
5. Reduced flow rate / less air expelled; 
6. So small / reduced diffusion or concentration gradient;

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