Gce Model Questions Vol1 2025 Biology Question 40
Practice objective / multiple choice question 40 from the 2025 Gce Model Questions Vol1 Biology examination.
The rate of oxygen diffusion across the alveolar membrane can be expressed by Fick's law \(\text{Rate}= \frac{D\,A\,\Delta P}{d}\), where \(D\) is the diffusion coefficient (constant), \(A\) the effective surface area, \(d\) the membrane thickness and \(\Delta P\) the partial pressure difference of O₂. In a healthy lung \(A=70\ \text{cm}^2\), \(d=0.2\ \mu\text{m}\) and \(\Delta P=100\ \text{mmHg}\). In a disease state the membrane thickness doubles and the effective surface area is reduced by 30 %. Assuming \(D\) and \(\Delta P\) remain unchanged, calculate the percentage change in the diffusion rate relative to the healthy lung.
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This is Gce Model Questions Vol1 2025 Biology Question 40. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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