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How the Lungs Work What Breathing Does for the Body
How does the respiratory system work? - Medical News Today
How Lungs Work - American Lung Association
Respiratory System: Functions and Organs - WebMD
How the Lungs Work How Your Body Controls Breathing
How Do We Breathe? - Scientific American
Respiratory System: Organs, Facts, Anatomy & Function - Cleveland Clinic
How the Lungs Work - The Lungs - NHLBI, NIH
Anatomy of breathing: Process and muscles of respiration
In brief: How do lungs work? - InformedHealth.org - NCBI Bookshelf