Grade 7 Asset

When we breathe in, we can feel the rib cage expand. It returns to the normal shape as we breathe out. One of the reasons why the shape of the rib cage can change is the ribs are attached to the sternum flexible cartilage allows ribs move ribs are long curved bones lungs have elastic walls( the ribs are attached to the sternum, flexible cartilage allows ribs move, ribs are long curved bones, lungs have elastic walls ).