Answer:
When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
Answer:
If you breath, your diaphragm contracts and moves down. When this happens, it increases the space that is in your chest cavity and lungs. The muscles between the ribs also enlarge. They contract yo pull the rib cage both upward and down.
Explanation:
