The lung is the essential respiration organ in many air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located near the backbone on either side of the heart. Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere. This exchange of gases is accomplished in the mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs called alveoli.
To completely explain the anatomy of the lungs, it is necessary to discuss the passage of air through the mouth to the alveoli. Once air progresses through the mouth or nose, it travels through the oropharynx, nasopharynx, the larynx, the trachea, and a progressively subdividing system of bronchi and bronchioles until it finally reaches the alveoli where the gas exchange of carbon dioxide and oxygen takes place.
The drawing and expulsion of air (ventilation) is driven by muscular action; in early tetrapods, air was driven into the lungs by the pharyngeal muscles via buccal pumping, whereas in reptiles, birds and mammals a more complicated musculoskeletal system is used.
Medical terms related to the lung often begin with pulmo-, such as in the (adjectival form: pulmonary) or from the Latin pulmonarius ("of the lungs"), or with pneumo- (from Greek πνεύμων "lung").
Other articles related to "lung, lungs":
... Lungs Right Lung Right and Left Lung Left Lung Right and Left Lung ...
25, 2006, Neilson succumbed to the lingering effects of her illness, and died of lung failure in Detroit at the age of 49 ... At the same time, former Clinton nominee Lewis discovered she had lung cancer in 2005, and she died of an inoperable tumor on her lung in 2007 ...
... without a known cause or as the result of a lung disease or acute lung injury ... Symptoms of this condition are often felt only on one side of the lung or as a shortness of breath ...
... Lung volume reduction surgery, or LVRS, can improve the quality of life for certain COPD and emphysema patients ... Parts of the lung that are particularly damaged by emphysema are removed, allowing the remaining, relatively good lung to expand and work better ... most severely affected areas of emphysematous, non-bullous lung (aim is for 20-30%) ...
... The lung allocation score (LAS) is a numerical value used by the United Network for Organ Sharing (UNOS) to assign relative priority for distributing donated lungs for transplantation within the ... The lung allocation score takes into account various measures of a patient's health in order to direct donated organs towards the patients who would best benefit from a lung transplant ... older method within the United States of allocating donated lungs strictly on a first-come, first-served basis, according to blood type compatibility and distance from the donor hospital ...
Famous quotes containing the word lung:
“Time is here and youll go his way.
Your lung is waiting in the death market.
Your face beside me will grow indifferent.
Darling, you will yield up your belly and be
cored like an apple.”
—Anne Sexton (19281974)
“Dylan used to sound like a lung cancer victim singing Woody Guthrie. Now he sounds like a Rolling Stone singing Immanuel Kant.”
—Also quoted in Robert Shelton, No Direction Home, ch. 2, Prophet Without Honor (1986)
“Lord, confound this surly sister,
Blight her brow with blotch and blister,
Cramp her larynx, lung and liver,
In her guts a galling give her.”
—J.M. (John Millington)