A-LevelBiologyGas exchangeOct/Nov 2017Paper 1 Q341 Mark
A good gas exchange system maintains a steep diffusion gradient, has a large total surface area and a short diffusion distance. Which feature of the human gas exchange system helps to maintain a steep diffusion gradient?
Alarge number of alveoli are present in each lung.
BAlveoli walls contain elastic fibres allowing expansion.
CThe air brought into the alveoli by ventilation is high in oxygen.
DThe endothelium of the capillary wall is made of flattened cells.
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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