A-LevelBiologyGas exchange9700/12 · May/June 2023 · Q371 Mark
The average thicknesses for some structures in the human respiratory system are shown. [Figure 37.1] A molecule of oxygen is in the alveolar air space next to the wall of the alveolus. What is the shortest distance that the molecule needs to diffuse from its current position to the haemoglobin that completely fills a red blood cell in the nearest capillary? (Assume that the red blood cells touch the walls of a capillary.)
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A595 nm
B600 nm
C605 nm
D610 nm
✓ Correct answer
C: 605 nm
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