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: As [[air]] is [[inhale]]d the '''rib cage''' expands due to [[Intercostal Muscle|intercostal muscles]] relaxing.
: As [[air]] is [[exhale]]d the '''rib cage''' pulls inward due to [[Intercostal Muscle|intercostal muscles]] contracting.
==Key Stage 4==
===Meaning===
The '''rib cage''' is the [[bone]]s in our [[thorax]] which serve to protect the [[lungs]] and [[heart]].