How does the lungs know which is O2 and CO2? We breathe a ton of different gasses daily but what happens to the other gases other than O2 and CO2 when inhaled?

Question

How does the lungs know which is O2 and CO2? We breathe a ton of different gasses daily but what happens to the other gases other than O2 and CO2 when inhaled?

In: 729

Answer 1

Imagine the Oxygen is square and the CO2 is Rectangular. Your lungs only have Square and rectangle holes other gases are the wrong shape, generally.

There are some gases that are the same shape.. those are toxic/poisonous to us.