Which body part do you use to breathe?

You use your lungs to breathe. Your lungs pull air in, grab the oxygen your body needs, and then push out the leftover gas your body doesn't need, all happening automatically without you having to think about it.

Your stomach handles digesting food, and your liver filters your blood and helps process nutrients; neither one is involved in moving air in and out of your body the way your lungs are.

You actually breathe roughly 20,000 times a day, all without ever having to consciously remember to do it, since a part of your brain handles that job automatically.