Why does the human rib cage stop halfway down when there are many

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Why do the rib muscles contract to expand the chest cavity

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Do ribs bend? If the spine bends and the sternum is rigid, surely

Why does the human rib cage stop halfway down when there are many vital organs lower down that would benefit from being protected by bones? - Quora

Rib cage, Anatomy & Function

Why do the rib muscles contract to expand the chest cavity