The Respiratory System

The primary organs of the respiratory system are lungs, which function to take in oxygen and expel carbon dioxide as we breathe. (Image credit: Leonello Calvetti | Shutterstock)

Oxygen goes in, carbon dioxide goes out. Sounds simple enough, but your respiratory system — composed of your lungs, trachea, sinuses, and sundry microscopic helpers — works a grueling 24/7 job just to keep your blood oxygenated, and your body alive. Learn all about the air you breath (and the respiratory organs that make it possible) here.

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