how is mouth to mouth (CPR) beneficial if you’re blowing carbon dioxide into their lungs?

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In: Biology

Answer 1

You still breathe out oxygen. Your body doesn’t completely filter out all the oxygen from a breath, it simply reaches equilibrium with the blood in your lungs. The blood gives up its CO2 and takes in the oxygen until your lungs and blood have the same ratio, and then you exhale more CO2 and less oxygen than you breathed in.