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===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]] relaxingcontracting and lifting the [[rib]]s.: As [[air]] is [[exhale]]d the '''rib cage''' pulls moves inward due to [[Intercostal Muscle|intercostal muscles]] contractingrelaxing.
==Key Stage 4==
===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]].