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Alveoli


alveoli: microscopic air sacs that are surrounded by a rich network of blood vessels in mammalian lungs that function in gas exchange; the air sacs are at the end of the bronchioles.
amino acids: the building blocks of proteins.
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alveoli Tiny, thin-walled, inflatable sacs in the lungs where oxygen and carbon dioxide are exchanged.
amensalism A symbiotic relationship in which members of one population inhibit the growth of another population without being affected.
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Only in the alveoli does actual gas exchange takes place. There are some 300 million alveoli in two adult lungs. These provide a surface area of some 160 m2 (almost equal to the singles area of a tennis court and 80 times the area of our skin!).
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alveolus pl. alveoli
(al-vee-oh-lus) [L. dim. of alveus, cavity, hollow]
(1) One of the deadend, multilobed air sacs that constitute the gas exchange surface of the lungs. (2) One of the milk-secreting sacs of epithelial tissue in the mammary glands.
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Gas exchange
Lung
Alveoli
References
W.F. Smith, Foundations of Materials Science and Engieering 3rd ed., McGraw-Hill (2004) ...
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The lungs of mammals are a rich lattice of alveoli, which provide an enormous surface area for gas exchange. A network of fine capillaries allows transport of blood over the surface of alveoli.
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emphysema An irreversible, obstructive lung disease in which airways become permanently constricted and alveoli are damaged or destroyed.
Emulsify To produce small droplets of a liquid.
emulsion A colloidal system in which both phases are liquids.
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In lungs, the narrowed ending of bronchioles that opens into a cluster of alveoli.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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In mammals the paired lungs are each supplied by a bronchus that divides, treelike, into bronchioles. Each bronchiole ends in an atrium from which arise numerous alveoli that contact a vast capillary system.
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