Asthma pathology, comparative illustration

Asthma pathology, comparative illustration

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Credit: HELENE FOURNIE, ISM/SCIENCE PHOTO LIBRARY

Caption: Asthma pathology, comparative illustration. The expanded diagrams show cross-sections through a normal airway (bottom left) and an asthmatic, constricted airway (bottom right). The airways have a ring of smooth muscle and a thin layer of endothelial tissue. In the asthmatic airway, the smooth muscle has contracted, and the tissue is inflamed. Endothelial cell debris and mucus are blocking the airway. Bronchodilator drugs widen the airway, making it easier to breathe.

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