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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.
The respiratory system supplies the body with oxygen needed to extract the energy from the food we eat. It gets this oxygen from the air we breathe. When we breathe this air out, we expel the waste carbon dioxide produced by the body. When we breathe in, air is inhaled through the nose and mouth. Air that passes through the nose gets warm and filtered. From the nose and mouth, the air goes through the windpipe and then to the lungs. Towards the end, the windpipe branches into two pipes called bronchi, with one entering each lung.