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8.1 Exchange surfaces and diffusion

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Question 23
F

Air entering an alveolus has a higher oxygen concentration than the arriving blood. The arriving blood has a higher carbon dioxide concentration than the alveolar air.

Which pair gives the directions of net diffusion?

[1]
A

oxygen into the alveolus; carbon dioxide into the blood

B

oxygen into the blood; carbon dioxide into the blood

C

oxygen into the blood; carbon dioxide into the alveolus

D

oxygen into the alveolus; carbon dioxide into the alveolus

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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