Blood flow to a group of alveoli becomes much slower. Ventilation, alveolar area and wall thickness remain unchanged.
Which explanation predicts the resulting change in oxygen uptake by the blood?
Oxygen is removed less rapidly, reducing the gradient and reducing net diffusion.
Oxygen is removed less rapidly, increasing the gradient and increasing net diffusion.
Oxygen is removed more rapidly, reducing the gradient and reducing net diffusion.
Oxygen is removed more rapidly, increasing the gradient and increasing net diffusion.
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.