Normally, the elastic tissue of the alveoli (tiny sacs in the - TopicsExpress

Normally, the elastic tissue of the alveoli (tiny sacs in the lung) enables them to stretch during inhalation, and return to their original shape during exhalation. This allows your body to absorb oxygen and expel carbon dioxide-filled air. But in emphysema (as you can see in the video to the left) the alveoli collapse on exhale, making them unable to effectively rid the body of carbon dioxide. This leads to the feeling of “shortness of breath” that characterize emphysema.

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