Human Anatomy Online - I found this website useful when teaching about the lungs. It has animations showing the movement of lungs, diaphragm and rib cage. Also a section diagram of a bronchial alveolus as well as description on how the lungs work.
Lungs and Breathing - As part of our work on Keeping Healthy we did an activity about the lungs. This was an introduction to the exercise section of Keeping Healthy. I thought this worksheet and activity would fit together with the other contributions.
Lung power point use - It would be better to show this power point version aswell as a slower one for use with pupils. So they can clearly pause it and you can get them to tell you what is happening to the pressure/volume and ribs and diaphragm at each stage. If you have access to an interactive whiteboard you can let the pupils write in their answers on the screen by the side of the picture.