If air is made up of 78% Nitrogen, our blood uses Oxygen and we exhale Carbon dioxide, what happens to nitrogen?

Question

If air is made up of 78% Nitrogen, our blood uses Oxygen and we exhale Carbon dioxide, what happens to nitrogen?

In: Biology

Answer 1

I knew this fact & yet upon reading this my brain came up with a scenario where aliens find some poor human astronaut adrift & try to help by giving them nitrogen since that’s the majority of the atmosphere. RIP astronaut.