Eli5: why are we told to breathe in through your nose and out through your mouth if all the oxygen gets in your blood stream in the lungs either way? Would it not be better to just breathe in and out of your mouth for the most oxygen?
In: Biology
Your nose has air filters, it makes the air safe to take in, it’s good at catching pathogens and stuff. Your mouth has enzymes and teeth, it turns food into mush, which your body turns into feul. So when you breath in through your nose, you filter it and make it safer, and when you exhale through your mouth, you push out all the co2.
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