The drawing has been made from a section showing part of an alveolus and a red blood cell in a capillary. The magnification of the drawing is $ \times 5000$
What is the minimum distance that oxygen must diffuse from air in an alveolus into a red blood cell?
1 )
0.1 nm
2 )
1.0 nm
3 )
$0.1\mu m$
$1.0\mu m$
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