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>    However, my general understanding is that the 
> effect is similar to surface tension on a liquid, or at
> at interface. The high pressures of nitrogen seem to
> cause the RBC's to become rigid, and therefor either
> jam in the small capillaries, or scrape theri way 
> through. I have seen this on film under the microscope,
> and know it to be true. 
>      There is some question as to why the presence of
> helium greatly diminishges this effect - that is the part 
> that is less well understood. 

It's very interesting that there are differences. The chemistry of 
transporting materials across cell membranes is VERY complicated.

It makes sense that there may be a portion of the gas inside a cell that 
does not arrive there by simple pressure differential diffusion but possibly 
by chemical pumping associated with metabolic processes.

Very interesting.

Rick

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