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How the Lungs Work What Breathing Does for the Body
Breathing - Wikipedia
What is respiration and gas exchange? - BBC Bitesize
How the Lungs Work - The Lungs - NHLBI, NIH
Mechanics of Breathing - Inspiration - TeachMePhysiology
22.3 The Process of Breathing – Anatomy & Physiology
How Do We Breathe? - Scientific American
Respiratory System: Functions and Organs - WebMD
Respiratory system structure and function - Respiratory system
The mechanics of breathing - Encyclopedia Britannica