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==Key Stage 3==
[[File:AirSacs.png|right|300px|thumb|A [[diagram]] showing several [[alveoli]] and the [[Capillary|capillaries]] supplying them with [[blood]].]]
===Meaning===
[[Alveoli]] are small air sacs in the [[lungs]] which are specially [[Adaptation|adapted]] for gas exchange.
: Singular [[Noun]]: '''Alveolus'''
==Key Stage 4==
[[File:AirSacs.png|right|300px|thumb|A [[diagram]] showing several [[alveoli]] and the [[Capillary|capillaries]] supplying them with [[blood]].]]
===Meaning===
[[Alveoli]] are small air sacs in the [[lungs]] which are specially [[Adaptation|adapted]] for gas exchange.