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===Meaning===
[[Alveoli]] are small air sacs in the [[lungs]] which are specially [[Adaptation|adapted]] for gas exchange.
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|[[File:AirSacs.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |A picture showing several [[alveoli]] and the [[Capillary|capillaries]] supplying them with [[blood]].
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: Singular [[Noun]]: '''Alveolus'''
: Plural [[Noun]]: '''Alveoli'''
===Adaptations of Alveoli===
: The [[alveoli]] have thin walls to allow gas exchange to happen quickly.
: [[Alveoli]] are in groups to make a large [[Surface Area|surface area]] in the [[lung]] for gas exchange.
: The [[alveoli]] have a good [[blood]] supply to allow gas exchange with the [[blood]].
: The walls of the [[alveoli]] are kept moist to allow gases to [[dissolve]] into to the fluid for gas exchange with the [[blood]].
===About Alveoli===
: The [[alveoli]] are where [[Oxygen]] enters the [[blood]] and [[Carbon Dioxide]] leaves the [[blood]].
: There are thousands of [[alveoli]] in each [[lung]].
: [[Alveoli]] are found at the end of [[bronchiole]]s.
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|[[File:AirSacsAlveolusGasExchange.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |The percentage of different gases found in A [[inhalediagram]] showing a single [[alveolus]] with the [[Oxygen]] going into the [[blood]] and [[Carbon Dioxide]] leaving the [[blood]]d air.
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