Reference Terms
from Wikipedia, the free encyclopedia

Lung

The lung is the essential organ of respiration in air-breathing vertebrates.

Its principal function is to transport oxygen from the atmosphere into the bloodstream, and to excrete carbon dioxide from the bloodstream into the atmosphere.

This it accomplishes with its mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs where gas exchange takes place.

Lungs also have nonrespiratory functions.

Note:   The above text is excerpted from the Wikipedia article "Lung", which has been released under the GNU Free Documentation License.
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July 4, 2015

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updated 12:56 pm ET