The diaphragm does most of the work during inhalation – but people can use “accessory muscles of breathing” to breathe. Additionally, one can breathe and keep their stomach still, implying that muscles other than the diaphragm are causing the chest to expand. How does that work??
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In addition to the diaphragm, there are also External intercostal muscles. They go between ribs, and contracting them pulls up the the ribs , which expands the rib cage.
https://en.wikipedia.org/wiki/External_intercostal_muscles
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