Reference Many complex processes go on inside the human body every day.
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.
The respiratory system is responsible for taking in oxygen and expelling carbon dioxide. The main organs are the lungs, which work in concert with the cardiovascular system.
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