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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


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
McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.


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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
El presente estudio tuvo como objetivo el reconocer y evaluar el potencial de los grupos mayores de peces (genero y familia) del arrecife coralino de Cabo Pulmo como bioindicadores de la estructura de la comunidad ictica a partir de criterios estadisticos.
Conservacion del arrecife coralino de Cabo Pulmo: Avances sobre el proceso de planeacion y propuesta de manejo.
El arrecife coralino de Cabo Pulmo, situado en los 23.5[grados] N y 109.5[grados] W, representa un tipo de ecosistema unico en el Golfo de California y posee una notable riqueza de especies marinas; por estas razones, el gobierno de Mexico lo declaro Parque Marino en 1995 (Reyes-Bonilla 1997).
CUADRO 1 Listado de especies de anomuros del arrecife de Cabo Pulmo-Los Frailes y alrededores, habitats de recoleccion (en Cabo Pulmo) y composicion zoogeografica.
Work from the early twentieth century on the hydromedusa Gonionemus veneris (Hargitt, 1897; Morgan, 1899) and the scyphomedusae Rhizostoma pulmo (Hargitt, 1904) and Cassiopea xamachana (Cary, 1916) showed regeneration from various mutilated stages.
The resort creates many opportunities for guests to create memories that will last a lifetime: whale watching on the Pacific Ocean, sailing on the stunning bays of Los Cabos, laying on the pearl white sand beaches, swimming in the turquoise lagoon in La Paz, and marine park exploration on the pristine beaches of Cabo Pulmo Park, which cradle some of the world's largest coral reefs.
Moutier, "Hypertension et mort par oedeme pulmo aigu chez les blesses cranio-encephaliques," Presse Med, vol.
The Pulmo Track-CC [47] (KarmelSonix Ltd., Haifa, Israel) includes a piezoelectric belt for monitoring chest wall motion, one lapel microphone, and two contact microphones placed on the trachea and the thorax (Figure 4(e)).
Influencia del Habitat Sobre la Asociaciones de Peces en el Arrecife Coralino de Cabo Pulmo, B.
"I believe that the scientists will be satisfied with the new national park because of the certainty that this biological treasure will be safe from the tuna fleets and the tourism megaprojects," columnist Horacio Salazar wrote in the daily newspaper Milenio, noting that the government has kept its commitment to prevent development of megaprojects in another protected area, Cabo Pulmo, in Baja California Sur (SourceMex, May 14, 2014, and Nov.
"Look, it's enormous," she said as she spotted one species, a pulsating violet-rimmed Rhizostoma pulmo " aka barrel jellyfish " drifting like a submerged plastic bag.