Carbon dioxide diffuses from respiring muscle cells into nearby capillary blood. The concentration of carbon dioxide in the arriving blood rises but remains lower than the concentration in the muscle cells. The concentration in the muscle cells and all other factors remain unchanged.
Which statement describes the initial effect on net diffusion of carbon dioxide?
Carbon dioxide changes direction and moves from the blood into the muscle cells at a higher net rate.
Carbon dioxide continues to move from the muscle cells into the blood, but at a higher net rate.
Carbon dioxide continues to move from the muscle cells into the blood, but at a lower net rate.
Carbon dioxide stops moving because it is now present in both the blood and the muscle cells.
102 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.