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?

Question

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

Answer 1

I’m so used to breathing through my mouth, is this a habit that I can learn to stop doing? I feel like my nasal cavity is too restricted so I just use my mouth.