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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]] relaxing.
: As [[air]] is [[exhale]]d the '''rib cage''' pulls inward due to [[Intercostal Muscle|intercostal muscles]] contracting.