How the Lungs Work - The Respiratory System | NHLBI, NIH
Overview of the Respiratory System - Lung and Airway Disorders - MSD Manual Consumer Version
Overview of the Respiratory System: Function and Structure | Thoracic Key
Lung - Wikipedia
Tracheostomy: What It Is and When It Is Needed
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Anatomy of the Respiratory System
National Heart, Lung, and Blood Institute (NHLBI) - To understand asthma, it helps to know how the airways work. People who have asthma have inflamed airways. The inflammation makes the airways swollen
Lungs and Respiratory System (for Parents) - Nemours KidsHealth