Respiratory
The respiratory system in Pandas delivers oxygen from the air through the nose to the tissues and also removes carbon dioxide out the mouth. The respiratory system is different from that of other vertebrates. All the cells in their body require oxygen. Without it, they couldn't move, build, reproduce, and turn food into energy. In fact, without oxygen, Pandas and you would die! How do you get oxygen? From breathing in air which their blood circulates to all parts of the body. Rib muscles contract to pull ribs up and out. The muscles contracts to pull down the lungs. Tissue expands to suck in air. Breath out you get rid of other gases that your body does not need. Rib muscles relax. The muscles relax. Tissue returns to resting position and forces air out.