lung

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lung

1. either one of a pair of spongy saclike respiratory organs within the thorax of higher vertebrates, which oxygenate the blood and remove its carbon dioxide
2. any similar or analogous organ in other vertebrates or in invertebrates

Lung

Paired, air-filled respiratory sacs, usually in the anterior or anteroventral part of the trunk of most tetrapods. They lie within the coelom and are covered by peritoneum. In mammals they are within special chambers of the coelom known as pleural cavities and the peritoneum is termed pleura.

Amphibian lungs are often simple sacs, with only small ridges on the internal walls. In higher forms the lungs become more and more subdivided internally, thus increasing greatly the surface areas across which the respiratory exchange takes place. However, even in many reptiles the lungs may be quite simple. Birds have especially complex lungs with a highly differentiated system of tubes leading into and through them to the air sacs which are contained in many parts of the bird's body. Mammalian lungs are simpler, but in them the internal subdivision into tiny sacs or alveoli is extreme; there may be over 350,000,000 of them in one human lung.

In humans the two lungs lie within the chest, separated by the heart and mediastinum. The right lung has three lobes and the left lung two. A bronchus, an artery, and a vein enter each lung medially at the hilum; each branches again and again as it enters the lobules and smaller divisions of the lungs (see illustration). The terminal airways or bronchioles expand into small clusters of grapelike air cells, the alveoli. The alveolar walls consist of a single layer of epithelium and collectively present a huge surface. A small network of blood capillaries in the walls of the alveoli affords surfaces for the actual exchange of gases. See Respiration, Respiratory system

The human lungenlarge picture
The human lung

lung

[ləŋ]
(anatomy)
Either of the paired air-filled sacs, usually in the anterior or anteroventral part of the trunk of most tetrapods, which function as organs of respiration.
References in periodicals archive ?
Toss in the luxury of privacy, a sprinkling of wildflowers, and many lungfuls of fresh spring air.
I've always felt fortunate to live near the coast - the spectacular horizon sunsets, the ability to jump in the car on a summer's day and feel the sand between your toes within minutes, the unlimited availability of lungfuls of fresh, unpolluted sea air.
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Fortunately, he had given his 'Mae West' inflatable lifejacket a few lungfuls of air before take-off.
ROBIN GAULDIE reports on how trend is now all for organic menus, pure spring water and lungfuls of fresh air - and where better to find all that goodness than in the spas springing up across Scotland...
Why cycle around the country, sucking in lungfuls of oxygen and getting somewhere and seeing things, when you can enjoy the niff of other people's daps and stay in watching the telly on your stationary bike in a gym?
Community safety officer Mark Gerrard said: "He only had a matter of seconds to do what he did because two or three lungfuls of toxic smoke will render you unconscious.
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On his own song Tuberiferous, he clearly shows a Michael Brecker influence, pumping lungfuls of air through the tenor as though he's battling a rock band at high volume rather than an acoustic jazz quartet.