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  • 1. MUSCLESJoin up the following definitions with their key words.Prime movers / Agonists - muscles that cause the joint to bendAntagonists - these muscles hold joints in positionFlexors - muscles that cause the joints to straightenExtensors - the muscle which relaxes against the agonistFixators - these muscles hold the body in position to enable agonists to workSynergists - the muscles that shorten to move the jointIsometric muscle contraction - muscle lengthens - bounding exercisesIsotonic concentric contraction - muscle shortens - pushing against a fixed objectIsotonic eccentric contraction -no movement occurs - bicep curls