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2.2 Animal tissues, organs and organ systems

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Question 36

A laboratory model was used to investigate how the thickness of a capillary wall affects the rate of oxygen diffusion. The concentration difference across the wall and the area of the wall were kept the same for each measurement.

Number of cell layers in the model wallRate of oxygen diffusion in mg cm⁻² min⁻¹
10.80
20.41
30.27

Explain the pattern in the results and suggest how a capillary wall that was several cells thick would affect the supply of oxygen to nearby body cells.

[3]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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