The respiratory system includes the nose, mouth, throat, voice box, windpipe, and lungs.
Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs called cilia (SIL-ee-uh) protect the nasal passageways and other parts of the respiratory tract, filtering out dust and other particles that enter the nose through the breathed air.
The lungs and respiratory system allow oxygen in the air to be taken into the body will also let in the body get rid of carbon dioxide in the air breathed out. When you breathe in the diaphragm moves downward towards the abdomen in the rib muscles pull the ribs upward and outward.
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