it not a gas it your brain
Oxygen is used for breathing. Our body cells then use this oxgen to produce energy (glucose), and give off carbon dioxide which is breathed out again!
http://wiki.answers.com/wiki/Neon (Ne) is an inert gas sometimes used in deep http://wiki.answers.com/wiki/Commercial_diving but is very...
Carbon dioxide
CO2 is main gas which controlls breathing not oxygen even though oxygen does have a small control rate.