A-LevelBiologyGas exchangeOct/Nov 2020Paper 1 Q331 Mark
The partial pressure of oxygen in air inside alveoli is 14 kPa. The partial pressure of oxygen in pulmonary capillaries is 6 kPa. What will be the effect of these partial pressures on diffusion?
ACarbon dioxide will not diffuse in any direction.
BOxygen will diffuse from alveoli into capillaries.
COxygen will diffuse from capillaries into alveoli.
DOxygen will diffuse equally in both directions.
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The correct answer is B. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
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