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: 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.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f491 ''Rib, page 118, GCSE Biology; Student Book, Collins, AQA '']