This is a great picture. I don’t speak any German, and been looking for an English version of it, but it shows how we work as if we were a machine. You can see the food going in and oxygen going in and CO2 going out with the Lunge (lungs), Herz (heart), Leber (liver), Galle (gall bladder), stomach, intestines and pancreas among other things. After studying the digestive system in quite some detail, it’s neat to see it explained in this way. Might have been a good way in the first place. 
