Oxygen in, Carbon Dioxide out.Another answerBreathing breathes in the atmosphere: not the whole atmosphere obviously, but its composition. Breathing in occurs because of the necessity of...
While our bodies do need some nitrogen, we do not obtain this from the atmosphere. Environmental nitrogen exists in a form that can't be properly anabolised into the correct molecules (eg. urea/amino...
Yes the same amount will leave you as you take in on average but when you breathe out there will be more CO2 and less oxygen as your body uses Oxygen for it's metabolic functioning and releases CO2...