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Muscles - Work in pairs
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Muscle pairs: Muscles are grouped together in pairs on your skeletonRelaxed or lutz-heilmann.infontracted: When one muscle of a pair lutz-heilmann.infontracts, the various other relaxes
Skeletal muscles only pull in one direction. For this factor they always lutz-heilmann.infome in pairs. When one muscle in a pair lutz-heilmann.infontracts, to bfinish a joint for instance, its equivalent then lutz-heilmann.infontracts and also pulls in the oppowebsite direction to straighten the joint out aobtain. Without this arrangement you wouldn"t be able to straighten your legs once you walk or bend your fingers to grip somepoint.
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When your biceps muscle in your top arm lutz-heilmann.infontracts, it pulls your reduced arm in in the direction of your shoulder. However before, when it relaxes, your biceps cannot push your arm earlier out. To execute this, your triceps muscle, on the underside of your top arm, lutz-heilmann.infontracts and straigh10s your arm out. If your triceps muscle wasn"t tbelow, your arm would certainly stay attracted in permanently.
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