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It is taken to the lungs and expelled when we exhale ADDITIONALLY: While Oxygen is transported by red cells, CO2 is dissolved in the plasma. (the liquid part of the blood).

If you remember your basic chemistry, when CO2 is dissolved it produces carbonic acid, that's the stuff that makes carbonated drinks fizzy, and it can dissolve some minerals. SO... The body buffers the CO2 to keep from building up too much carbonic acid. When you hold your breath the body cannot expel the CO2 and your blood starts to become more acidic. THAT is the real reason you get the sensation that you MUST take a breath, your body is trying to expel the CO2. You can't detect low levels of oxygen nearly as well as you can detect high levels of CO2. If oxygen is removed from air and replaced with an inert gas, you won't notice it, you'll just go to sleep since the body can still expel the CO2.

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16y ago

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