vP5,6 and p7 did an experiment to find out more about the lungs and how they work. The big pink balloon at the bottom represents the diaphram, the bottle is the ribcage which protects the lungs, the smaller balloon is the lung which inflates and deflates when your pull the diaphram, and the straw represents the trachea which lets your air travel safely from your mouth and nose to your lungs. When your blood absorbs oxygen, little sacs called alveoli take it to your bloodstream. Carbon dioxide is flushed out of our bodies when we breathe out. Our next steps are to learn about the veins, bronchioles, main bronchus, the alveoli and how they work and where carbon dioxide comes from.