Lung Cancer: What It Is

The human lungs are a pair of organs located in the chest cavity within the ribcage. The right lung consists of three sections, known as lobes. The left lung has only two lobes. The smaller left lung allows room for the heart inside the chest.

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As you inhale, air enters the body through the nose or mouth and travels through the windpipe, or trachea, to the lungs. Two tubes, called bronchi, connect the trachea to the lungs and branch out into multiple smaller bronchi. The bronchi divide into even smaller branches known as bronchioles. The alveoli are tiny air sacs located at the end of each bronchiole.