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When we breathe from our mouth or nose, the air, which contains oxygen, nitrogen, and other types of gases, pass the larynx, where the vocal cords locate. When oxygen reaches the chest cavity, the bronchi divides itself so that the bronchi can direct the oxygen to the lungs. When the bronchial tubes direct the oxygen and air into the alveoli, it then reaches your bloodstream. When the respiratory system finishes its course, the diaphragm, which locates under the chest cavity, eliminates carbon dioxide. This explains why we have to exhale after we inhale.

The main purpose of the respiratory system is to supply oxygen for the blood and other organs such as the brain.

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