Why does only nose breathing produce nitric oxide?

Question

I was reading about the differences between mouth and nose breathing, and it seems that nitric oxide is beneficial to cardiovascular health, but that only breathing through one’s nose produces it. I couldn’t seem to find a simple explanation for it.

Edit to add: I thought this was a genuine question about something I didn’t understand but wanted to. So much(passive) aggression in the comments. Apologies. I was just trying to learn.

In: 2430

Answer 1

I never knew this. Is this why it’s recommended to inhale through the nose and exhale through the mouth when doing cardio workouts? Or is that just for the purpose of regulating your breaths?