Igcse Model Questions Vol1 2019 Biology Question 35
Practice objective / multiple choice question 35 from the 2019 Igcse Model Questions Vol1 Biology examination.
The diagram shows the human respiratory system with the alveolar surface area for gas exchange indicated as \(70\ \text{m}^2\) and the average diffusion distance across the alveolar-capillary membrane as \(0.5\ \mu\text{m}\). In a certain lung disease the effective alveolar surface area is reduced by \(40\%\) and the diffusion distance is increased by \(25\%\). According to Fick's law, the rate of diffusion is proportional to surface area divided by diffusion distance. Determine the factor by which the diffusion rate is changed (expressed as a decimal fraction of the normal rate).
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This is Igcse Model Questions Vol1 2019 Biology Question 35. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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