CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Biomedical illustration of an asthma attack (right) showing air passages blocked by mucus and muscle contraction, restricting the ability to breathe, and air has become trapped in the alveoli. A normal airway is shown on the left.
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