MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
An illustration of alveoli damaged by emphysema. Emphysema is a disease often caused by cigarette smoking. It affects the lungs and the alveoli in the lungs where the exchange of oxygen and carbon dioxide occurs. The damage to the alveoli prohibits them from taking the shape necessary for inhalation and breathing.
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