1. To learn more about your lungs, go the American Lung Association or National Emphysema Foundation Web sites.

You can also review what you've learned about the respiratory system with this Flash presentation.

2. A second stack of lung CT images is provided for additional analysis. View the stack by selecting ExploreLungStk2.tif from the list adjacent to Select Image Stack. Images for two patients are provided, with an upper and lower lung image for each.