All your bits inside your torso take up a specific amount of space. When you take a breath your lungs are expanding because a muscle below your lungs, the diaphragm, pulls them downward. Toward your stomach. Which pushes your stomach out of the way because there’s only so much space. Fortunately, your belly (and your ribs to a lesser extent) can expand to accommodate all this pushing and pulling as you breathe.
Latest Answers