What are lungs?

Lungs

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.

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Some articles on lungs:

Acinus - Lungs
... The respiratory bronchioles in the lungs terminate in acini, many-lobed sacs containing groupings of alveoli ...
Lungs - Addtional Images
... Lungs Right Lung Right and Left Lung Left Lung Right and Left Lung ...
Tarantula - Respiratory System
... In all types of tarantula there are two sets of book lungs (breathing organs) ... The first pair of book lungs is located in a cavity inside the lower front part of the abdomen near where the abdomen connects to the cephalothorax ... Each lung consists of 15 or more thin sheets of folded tissue arranged like the pages of a book ...
Lecithin-sphingomyelin Ratio - Evaluation
... The lecithin–sphingomyelin ratio is a marker of fetal lung maturity ... The outward flow of pulmonary secretions from the fetal lungs into the amniotic fluid maintains the level of lecithin and sphingomyelin equally until 32–33 weeks gestation, when the lecithin concentration begins ... if a sample of amniotic fluid has a higher ratio, it indicates that there is more surfactant in the lungs and the baby will have less difficulty breathing at birth ...
Bornean Flat-headed Frog
... It is the second frog known to have no lungs ... specimens and discovered for the first time that the frogs had no lungs ... and the liver) take up much of the space which normally would be filled by the lungs ...