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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: Organs, Facts, Anatomy & Function - Cleveland Clinic

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

  7. Respiratory System: Functions and Organs - WebMD

  8. How the Lungs Work - The Respiratory System | NHLBI, NIH

  9. How Lungs Work - American Lung Association

  10. 39.9: Breathing - The Mechanics of Human Breathing