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Lung is the chief breathing organ of mammals, birds, reptiles, and most adult amphibians. The main job of the lungs is to exchange gases. As blood flows through the lungs, it picks up oxygen from the air and releases carbon dioxide. The body needs oxygen to burn food for energy, and it produces carbon dioxide as a waste product. This article discusses the human lungs, but the lungs of other animal's function in a similar way. Parts of the lungs. Human beings have two lungs--a left lung and a right lung--, which fill up most of the chest cavity. A lung has a spongy texture and may be thought of as an elastic bag filled with millions of tiny air chambers, or sacs. If the walls of the air sacs could be spread out flat, they would cover about half a tennis court. The somewhat bullet-shaped lungs are suspended within...

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