That's right. And if red blood cells cannot hold oxygen, then the rest of the cells cannot be oxygenated.
The Hemoglobin in the Red Blood Cells has an affinity for Carbon Dioxide and Carbon Monoxide that is stronger than is it’s attraction to ordinary O2.
This makes CO2 poisoning a very serious threat to the Human (all creatures) metabolism.
The PCO2 and PAO2 in the bloodstream represent that the 2 molecules are in competition for the free ride that the Hemoglobin provides.
Sir, please forgive me as I have no interest in arguing with you on any subject. I simply admire your Posts too much to find myself on your bad side.
Still, we are somehow discussing elements of my Profession. I am sorry for that.
I would prefer to just end this now. I have no need of any sort of adversarial discourse. I quit.