In this animation, you can take an animated tour of the lungs. Click on different parts of the anatomy to better understand the animation, click to zoom in, turn, or zoom out on the structure. In Chapter 1, we begin with healthy lung that you can move around to better understand. Chapter 2 illustrates COPD with hyperinflation. Moving to Chapter 3, we see healthy alveoli, before comparing alveoli in COPD with exacerbation in Chapter 4. Finally, in Chapter 5 you can see the increase in eosinophils.