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

  2. How does the respiratory system work? - Medical News Today

  3. How Lungs Work - American Lung Association

  4. Respiratory System: Functions and Organs - WebMD

  5. How the Lungs Work How Your Body Controls Breathing

  6. How Do We Breathe? - Scientific American

  7. Respiratory System: Organs, Facts, Anatomy & Function - Cleveland Clinic

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

  9. Anatomy of breathing: Process and muscles of respiration

  10. In brief: How do lungs work? - InformedHealth.org - NCBI Bookshelf