Explanation:
Your respiratory and muscular systems work together in fascinating ways to keep you alive and active. When you breathe in, your diaphragm, a muscle located below your lungs, contracts and moves downward, creating more space in your chest cavity and allowing your lungs to expand. The intercostal muscles between your ribs also help by lifting your ribcage. This coordinated effort allows air to flow into your lungs where oxygen is exchanged for carbon dioxide, a waste product, in the blood. The muscles then relax, pushing carbon dioxide-filled air out of your lungs when you exhale.
