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Lungs
...  divided into three. The lungs are located in the chest cavity inside the rib cage. They are made of elastic, spongy tissue as they stretch out and constricts while you breathe. The trachea and the bronchi are the airways that bring the air to the lungs. They are made of smooth muscle and cartilage, which allows the airways to constrict and expand. The duty of the lungs and the airways is to  ...


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