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

  2. Breathing - Wikipedia

  3. What is respiration and gas exchange? - BBC Bitesize

  4. How the Lungs Work - The Lungs - NHLBI, NIH

  5. Mechanics of Breathing - Inspiration - TeachMePhysiology

  6. 22.3 The Process of Breathing – Anatomy & Physiology

  7. How Do We Breathe? - Scientific American

  8. Respiratory System: Functions and Organs - WebMD

  9. Respiratory system structure and function - Respiratory system

  10. The mechanics of breathing - Encyclopedia Britannica