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 the red blood cell?

1 )
$0.1nm$
2 )
$1.0{\text{ }}nm$
3 )
$0.1\mu m$
$1.0\mu m$
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