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    Supposedly the venous Hb is still 75% saturated and we only use about 25% 
of the arterial O-Hb.   However;

   The unshifted dissociation curve shows Hb as about 50% saturated at a PPO2 
of 40 mm Hg.   Various agents shift the curve so that in the venous flow Hb 
is reportedly 75% saturated at this same O2 concentration (40mm Hg).    Is 
this 75% of what Hb is capable of carrying after the influence of CO2, H+, 
and 2-3 BPG shifts the curve? 
   If so, then it appears that we use more than 25% of the O-Hb stores at 
rest.  ? ? ?

Anybody got a handle on this ?

Chuck
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