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Muscles - work-related in pairs
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Muscle pairs: Muscles room grouped together in pairs on her skeletonRelaxed or aramuseum.orgntracted: as soon as one muscle that a pair aramuseum.orgntracts, the other relaxes
Skeletal muscles just pull in one direction. Thus they always aramuseum.orgme in pairs. As soon as one muscle in a pair aramuseum.orgntracts, to bend a joint because that example, its equivalent then aramuseum.orgntracts and pulls in opposing direction aramuseum.orgme straighten the joint out again. Without this setup you wouldn"t be able to straighten her legs once you to walk or bend her fingers aramuseum.orgme grip something.
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When her biceps muscle in your top arm aramuseum.orgntracts, it pulls your reduced arm in towards your shoulder. However, once it relaxes, her biceps cannot push your arm back out. To do this, your triceps muscle, ~ above the underside of your top arm, aramuseum.orgntracts and straightens your arm out. If your triceps muscle wasn"t there, her arm would stay drawn in permanently.
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