O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2014 · Q161 Mark

Some characteristics of the human gas exchange system are listed. 1 a difference in temperature between the air in the alveoli and the blood 2 a large surface area of the alveoli and the blood capillaries 3 a short diffusion distance between the air and the blood 4 elastic fibres in the walls of the alveoli Which factors affect the rate of oxygen uptake into the blood?

A1 and 2

B1 and 3

C2 and 3

D3 and 4

✓ Correct answer

C: 2 and 3

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2014 Paper 1 Variant 1, question 16.

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