Fick's law shows that the rate of diffusion depends on three factors.
rate of diffusion∝surface area×concentration differencethickness of membrane \text{rate of diffusion} \propto \frac{\text{surface area} \times \text{concentration difference}}{\text{thickness of membrane}} rate of diffusion∝thickness of membranesurface area×concentration differenceExplain how the structure and function of the lungs increase each of the factors in Fick's law to give a high rate of gas exchange.
42 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.