Muscles Pull onBones: Muscles only contract, never extend (unless stretched by outside forces). E.g. Diaphragm muscles (dome shaped) contract. Since edges are attached to lower edges of rib cage the dome flattens: pushing abdominal organs down & allowing air pressure to expand lungs within rib cage. Similarly pelvic muscles contract to lift abdominal organs preventing bulging through the large peroneal pelvic opening.
Answered 6/23/2017
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