Health, Sports & Psychology
Supporting physical development in early childhood
...carbon dioxide, but it has two parts. The upper respiratory tract includes the nose, mouth, throat and sinuses (air filled spaces above and behind the nose). The lower respiratory tract is made up of the voice box (larynx), the windpipe (trachea), the airways (bronchi) and the lungs. When you breathe in, you take in oxygen. In the lungs, oxygen is diffused into the blood...