What Are the Diseases Like Emphysema?

The lung itself has elastic tissue incorporated within it. And this is... What are the diseases like emphysema where you lose that elasticity? You take a breath in and the airways open up really nicely, but they don't snap back. Instead of a balloon filling a balloon up and letting it go, it will empty itself. It's almost like if you did it with a paper bag, it just stays full. Emphysemaics would suffer from an overinflated lung which can cause them to be kind of barrel-chested.