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2.2 Animal tissues, organs and organ systems

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Question 99
F

The lungs of an adult contain about 4.8 × 108 alveoli. The total surface area of these alveoli is 72 m2 .

a.

Calculate the mean surface area of one alveolus. Give your answer in standard form.

[3]
b.

A tennis court has an area of 260 m2 . Calculate the total surface area of the alveoli as a percentage of the area of a tennis court.

[2]
c.

Explain why having such a large total alveolar surface area is an advantage.

[2]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

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

179 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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