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> > By breathing O2 you have flushed the CO2 from your system.  The result is 
> > as the O2 in your lungs is metabolised and converted into CO2 the 
> > resulting Patrial Pressure of CO2 is to low to trigger breathing.
> 
> At the risk of being pedantic, please note that the O2 you breathe is 
> NOT converted to CO2.  The CO2 comes from the metabolism of molecules 
> like glucose, free fatty acids, etc.  The O2 is changed to H2O by the 

Oh which I am very fully aware which is why for reason of brevity I 
simply used the term metabolised assuming that most readers would could 
fill in the blanks themselves.

> You are, however, partially correct in that the lowered pCO2 will 
> extend his "bottom time" even further.  Anyone who is acclimated to 
> CO2 is anyway at great risk when breath-hold diving.
> 

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