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And the lungs are a core component of this vital task. The lungs are part of the respiratory system, and are divided into lobes or sections. The right lung has three lobes and the left lung has two lobes. You can think of each lobe as a balloon: It inflates when you breathe in and deflates when you breathe out. Each lung sits next to the heart. They are safeguarded by a thin tissue called the pleura. Inside the lungs are millions of tiny air sacs called alveoli. These sacs â about 300 million total â are overlapped or interwoven by capillaries, which are fine blood vessels.
This system includes your airways, your lungs, and the blood vessels and muscles attached to them that work together so you can breathe. The respiratory systemâs main function is to supply oxygen to all the parts of your body. It does this through breathing: inhaling oxygen-rich air and exhaling air filled with carbon dioxide, which is a waste gas. This is how the respiratory system works: first you breathe air in through your nose and mouth, which wet and warm the air so it wonât irritate your lungs. Then the air travels through your voice box, down your windpipe, and though two bronchii (bronchial tubes) into your lungs. Cilia, tiny mucous-covered hairs, in your airways trap foreign particles and germs to filter the air that you breathe. You then cough or sneeze the particles out of your body. The diaphragm, abdominal muscles, and ...