Figure 11 - The effect of mismatched ventilation 
and perfusion 
on arterial oxygenation.
From the following article
Anatomy, development, and physiology of the lungs
Richard M. Effros
GI Motility online (2006)
doi:10.1038/gimo73
Low 
/ ratio in right lung results in decreased saturation that cannot be compensated for by increasing ventilation to the left lung.
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