How does the lungs know which is O2 and CO2? We breathe a ton of different gasses daily but what happens to the other gases other than O2 and CO2 when inhaled?

Question

How does the lungs know which is O2 and CO2? We breathe a ton of different gasses daily but what happens to the other gases other than O2 and CO2 when inhaled?

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Answer 1

High CO2 in blood swaps places with O2 in the lungs. As for other gasses, lungs don’t know how to recognize anything but CO2 so they don’t notice if there’s no available oxygen