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Scott, Ben, Perhaps I worded my query badly. What I really wanted to know was how Hb could hold on to 75% of it's arterial load at 40 mm PPO2 when the curve I was looking at defied the prospect. When I finally checked out the saturation curves in some other references I discovered that I had been looking at a curve that was shifted considerably but not noted as such, which made everything look wrong. As a matter of fact, every curve I looked at was different. Some show 97% saturation at 105mm and 75% saturation at 40mm on a single un-shifted curve. The one that I am convinced is the correct un-shifted curve shows 97% saturation at 105mm and about 85% saturation at 40mm. A slight shift to the right after passing through resting tissues that are not producing a lot of CO2 would apparently leave Hb with about 75% of it's load after dumping enough to maintain a minimum venous PPO2 of about 40mm (average resting tissue, of course). Sorry I jumped the gun on this. I hope it sheds some light on it for you, Scott. Chuck -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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