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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 lungs consist of two cone shaped spongy organs that contain alveoli and trap air for gas exchange. The lung is designed for gas exchange. Its prime function is to allow oxygen to move from the air into the venous blood and carbon dioxide to move out. Although the lung performs other functions, its primary responsibility is to exchange gas.