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The lungs are the primary organ in respiration. They are sponge-like organs that are divided into lobes. Although the right lung has three lobes, the left lung has only two lobes due to the position of the heart, which is toward the left side of the body.

During respiration, air travels through the nose, down the trachea or windpipe, and into the bronchus. The bronchus branches into narrower bronchioles and then into smaller and smaller airways ... more