A horse receives less oxygen in the blood flowing to its leg muscles.
Which statement explains why this can limit sustained running?
The muscle cells have less oxygen available to transport other substances.
The muscle cells have less oxygen available to act as a solvent.
The muscle cells have less oxygen available for aerobic respiration.
The muscle cells have less oxygen available for growth and repair.
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.