The average thicknesses for some structures in the human respiratory system are shown.
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.)
1 )
595 nm
2 )
600 nm
605 nm
4 )
610 nm
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