Take a Look Inside the Lungs

The lung resembles a sponge with tiny holes. It is made up 90% blood and 10% tissue.

Your lungs work best when they are clean. Keeping the lungs clean is very important in preventing infections and delivering oxygen to the body.

Normal, healthy lungs produce thin, clear mucus (a sticky fluid) to protect the lungs. When something irritates the lungs (dirt, fumes, or smoke) the lungs make more mucus to protect the delicate lung tissue.