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> in my training, and I don't see any references to it in literature, but
> it occured to me that high fractions of inspired O2 might lead to lowered
> blood CO2, thereby increasing the risk of hyperventilation.
> 
> Thanks for any help,
> Scott.


I don't really think that increased pp of inspired O2 will affect 
blood CO2 levels since CO2 only makes up about 0.03% of "normal" 
inspired air. However, significant amounts are produced from 
cellular respiration (CO2 makes up something like 4% of expired air), 
and I would think that it is this increased CO2 that would give the 
stimulus to breathe.

Cheers !                      
Bridget Elliott                             /\          /\
Department of Zoology                     / /\\    @@  //\ \
University of Port Elizabeth             ///\ \\ (())) //\\ \
Box 1600                                 ////\\ ((***))//\\ \ 
Port Elizabeth                           //    \ ((())/   \\  
South Africa                            /                  \
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