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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.
Oxygen Therapy. The lungs work by bringing in the âgood airâ and getting rid of the âbad air.â You breathe in oxygen (O2) and it is passed into your blood through the tiny air sacs (alveoli) in the lungs. From there it goes to every part of your body.