Saltwater_Parrot
Registered
How do you suppose the nitrogen in your drink might get from your stomach into your bloodstream? There are no alveoli in the digestive tract.
All/most of our bodies tissues are capable of gas exchange, not just the alveoli. The difference between the stomach and lungs is not whether or not gas can permeate said tissue, it's efficiency, and gas exchange in the lungs is obviously much, much more efficient. Gas exchange in the stomach is still definitely possible though.