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

Imagine our bodies are like houses. When we breathe in, we bring in oxygen, which is like the good air we need to live. Our bodies use the oxygen, but we don’t need all of it, so we breathe out the leftover air, which has some carbon dioxide in it. Now, nitrogen is like the air around our house that we don’t use inside. It’s still important, but our bodies don’t need it, so when we breathe, we just leave the nitrogen in the air outside.