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→Key Stage 4
: The [[blood]] supply to the [[alveoli]] is very good to constantly supply of [[blood]] with little [[Oxygen]] and a lot of [[Carbon Dioxide]] keeping a high [[Concentration Gradient|concentration gradient]].
: 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.
{| class="wikitable"
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|[[File:AlveolusGasExchange.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |A [[diagram]] showing a single [[alveolus]] with the [[Oxygen]] going into the [[blood]] and [[Carbon Dioxide]] leaving the [[blood]].
|}