Lungs Parts

The lung is an organ of the Respiratory System of air-breathing vertebrates and some fishes and amphibians that takes in atmospheric oxygen, needed for energy production, and at the same time expires carbon dioxide, a waste product of this metabolism. The lungs of most animals consists of two elastic chambers, usually located in the thorax, with thin linings across which oxygen and carbon dioxide are exchanged between blood capillaries and the air within the chamber.

In evolutionary term, lungs are the counterparts of the gills of fish and crustaceans, which are adapted for extracting oxygen from water, and the tracheae of insects, which pipe oxygen directly to the tissues. The development of the lungs permitted the eventual evolution of oxygen, which can be extracted more quickly from air than from water.

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