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Social Sciences 10 Online
OpenStudy (anonymous):

Which muscles work in pairs? cardiac muscles skeletal muscles smooth muscles

OpenStudy (boonerileycat):

The first one?

OpenStudy (jebonna):

Its skeletal muscles. Skeletal muscles only pull in one direction. For this reason they always come in pairs. When one muscle in a pair contracts, to bend a joint for example, its counterpart then contracts and pulls in the opposite direction to straighten the joint out again.

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