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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


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


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 ?
Rhizostoma pulmo insana hafif-orta derecede toksisite gosteren turler arasinda yer almaktadir.
Owing to heavy exploitation for the fin trade and slow rates of reproduction, this family of predators remains rare inside Cabo Pulmo and out, Aburto-Oropeza says.
The results of the Cabo Pulmo study confirm that reserves can play a key role in ensuring that Oregon leaves a legacy of healthy oceans for future generations.
A biomass increase of 463 percent in a reserve as large as Cabo Pulmo (71 square kilometers) represents tons of new fish produced every year.
said Alejandro Gonzalez, who manages the Cabo Pulmo marine park for the government.
Con el fin de obtener en el perfundido un pH inicial de 7,9, se tomaron 50 cc de sangre expandida para perfundir los pulmo nes durante los 15 minutos de estabilizacion, luego fue remplazada por los restantes 200 cc de sangre a los que previamente se les agrego bicarbonato hasta obtener un pH de 7,9.
Segun explica el biologo Carlos Eduardo Narro Flores (de 45 anos de edad, originario del DF), de la Comision Nacional de Areas Naturales Protegidas (CoNANP) de la SEMARNAT, Cabo Pulmo fue declarado Parque Nacional en junio de 1995; mas tarde lo hicieron Reserva de la Biosfera.
Infla<mma> tus pulmo quando ligor patitur corriciae id est reuma frigida discendit desuper distillat uua qui infundir pulmonis languiscent.
Puede ser subcutanea o intramuscular, aunque en la mayoria de los casos el proceso se localiza a nivel pulmo nar y visceral y puede determinar la muerte, cuando es muy intensa.
The environmentalist and his wife, who have two sons, maintain a family summer home on the water in Winter Harbour, as well as a place in Vancouver city and a vacation home in Cabo Pulmo, in Mexico's Baja California, "our little corner of Nirvana.
Some of the more common species include the copepod Temora longicornis, two species of jellyfish, the common jellyfish (Aurelia aurita) and Rhizostoma pulmo, polychaetes, such as lugworms (Arenicola marina) and ragworms (Nereis diversicolor), mussels (Mytilus edulis), cockles (Cerastoderma edule), the Baltic tellin (Macoma balthica), the sandgaper (Mya arenaria), the common shore crab (Carcinus maenus) and the common shrimp (Crangon crangon).
In a remote area reachable only by a rough road that runs through a cactus-laden desert, Mexico's Cabo Pulmo Bay appears abruptly from a bluff overlooking Baja's Sea of Cortez.