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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 also help the body to get rid of CO 2 gas when we breathe out. There are a number of other jobs carried out by the lungs that include: 1  Changing the pH of blood (whether the blood is more acid or alkali) by increasing or decreasing the amount of CO 2 in the body. 2  Filtering out small blood clots formed in veins.