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8.1 Exchange surfaces and diffusion

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Question 9
F

Which feature of alveoli provides a short diffusion distance?

[1]
A

surfaces that are kept moist

B

spaces that contain fresh air

C

walls that are one cell thick

D

networks that carry the blood

Markscheme

8.1 Exchange surfaces and diffusion Questions

  1. GCSE
  2. /Biology
  3. /8.1 Exchange surfaces and diffusion

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.

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