dawg how is that supposed to be made in TPT?
So, ... please don't missinform. don't do things and then claim they are realistic if you don't know anything about it, letalone made any research.
what lungs do is pump oxygen and put it in the blood, the blood gets the oxygen to organs and tissues. The organs and tissues will then use the oxygen and turn it into three different things : Energy, water and Co2 waste. The waste goes back in the blood, the blood runs through the lungs, The lungs take the Waste away and replaces it with newly breathed Oxygen. We then expel the CO2 by exhaling.