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: [[Breathing]] in is called [[Inhale|inhaling]] and [[breathing]] out is called [[exhale|exhaling]].
: The [[lungs]] contain many [[alveolus|alveoli]] that exchange [[Oxygen]] and [[Carbon Dioxide]] with the [[blood]].
==Key Stage 4==
===Meaning===
The [[lungs]] are [[organ]]s in the [[Breathing System|breathing system]] used to [[transfer]] [[oxygen]] from the [[air]] to the [[blood]] and [[transfer]] [[Carbon Dioxide]] from the [[blood]] to the [[air]].