Eli5: Why does the stomach shrink when taking the air in and expand when breathing out?

Question

Shouldn’t it be the other way around?

In: 2

Answer 1

Not a doctor btw. But when you breath in, air goes into your lungs causing them to expand. There’s only so much room in the body so things have to shrink a little to allow the lungs to fill up. When you breath out the lungs get smaller because there is no air, so everything else in your body has more room to expand.