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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 ?
Furthermore, the UN Educational, Scientific and Cultural Organization (UNESCO) announced in July 2013 that the islands and protected areas in the Gulf of California, including Cabo Pulmo, would be added to the list of World Heritage Sites.
We can guarantee that the development of this project will harm the health of the Cabo Pulmo reef, particularly via the runoff of contaminants," said a statement from environmental experts, who conducted a thorough review of the MIA.
The scientists have been combining efforts to monitor the Gulf of California's rocky reefs every year for more than a decade, sampling more than 30 islands and peninsula locations along Baja California, stretching from Puerto Refugio on the northern tip of Angel de la Guarda to Cabo San Lucas and Cabo Pulmo south of the Bahia de La Paz.
Other large fish at Cabo Pulmo include gulf groupers, dog snappers and leopard groupers.
In June of 1995, the Mexican government designated Pulmo Reef (including two other bays to the north and south) as one of three National Marine Parks in Baja California.
Jocelyn Dupuis (the scientific director and originator of the PulmoBind Molecular Imaging technology), and by Pulmo BioTech Inc.
Commenting on the appointment, Garry McCann, Pulmo BioTech's CEO, said "we are delighted that Professor Wallwork has agreed to join the Board of Pulmo BioTech.
Pulmo BioTech's operational subsidiary, PulmoScience, is planning Phase II Human Trials for its PulmoBind product candidate for the Molecular Imaging of the vascular system of the lungs, which will follow the successful completion of its Phase I trials.
The PulmoBind product candidates being developed by Pulmo BioTech subsidiary PulmoScience are designed to allow the imaging of the vascular system of the lungs by a diagnostic clinician and thus enable the diagnosis of Pulmonary Embolism, Pulmonary Hypertension and Lung Inflammatory conditions.
NEW YORK, May 16 /PRNewswire-FirstCall/ -- Pulmo BioTech Inc.
NEW YORK, May 9 /PRNewswire-FirstCall/ -- Pulmo BioTech Inc.
NEW YORK, May 2 /PRNewswire-FirstCall/ -- Pulmo BioTech Inc.