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==Key Stage 3==
[[File:RibCage.png|right|300px|thumb|A clipart image of the '''rib cage'''.]]
===Meaning===
The '''rib cage''' is the [[bone]]s in our [[thorax]] which protect the [[lungs]] and [[heart]].
==Key Stage 4==
[[File:RibCage.png|right|300px|thumb|A clipart image of the '''rib cage'''.]]
===Meaning===
The '''rib cage''' is the [[bone]]s in our [[thorax]] which protect the [[lungs]] and [[heart]] as well as expand and contract to allow [[breathing]].
===About the Rib Cage===
: The '''rib cage''' is part of the [[Breathing System|breathing system]].
: As [[air]] is [[inhale]]d the '''rib cage''' expands due to [[Intercostal Muscle|intercostal muscles]] contracting and lifting and pulling the [[rib]]s up and outwards.
: As [[air]] is [[exhale]]d the '''rib cage''' moves inward due to [[Intercostal Muscle|intercostal muscles]] relaxing.