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The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
Your right lung has three parts 1  (. lobes. ). 2  Your left lung is. smaller and has two lobes. Inside the chest are two thin layers of tissue (the. 3  pleura. ). One layer covers the lungs and the other layer lines the. inside of your chest.  Cancer 1  Cells. Cancer begins  in. 1  cells. , the building blocks that make  up all.