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  1. Breathing - Wikipedia

  2. Human respiratory system - Mechanics, Lungs, Airways | Britannica

  3. Respiratory system - Wikipedia

  4. How Do We Breathe? - Scientific American

  5. Respiratory System: Functions and Organs - WebMD

  6. Human Need of Air - The Engineering ToolBox

  7. Breathing gas - Wikipedia

  8. How the Lungs Work What Breathing Does for the Body

  9. Human respiratory system | Description, Parts, Function, & Facts ...

  10. Minimum Oxygen Concentration For Human Breathing