How does your body pull air in and push it out?

The process of breathing involves the contraction of the diaphragm, a dome-shaped muscle located below the lungs. When you inhale, the diaphragm contracts and moves downward, creating more space in the chest cavity for the lungs to expand and fill with air. When you exhale, the diaphragm relaxes and moves back up, pushing the air out of the lungs.