Moving a leg or arm back and forth requires opposing sets of muscles called antagonistic muscles.
In an antagonistic muscles pair, one muscle contracts while the other muscle relaxes. The muscle that contracts is called the agonist while the muscle that relaxes or lengthens is called the antagonist.
Antagonistic muscles always work in synergy, that is when one muscle contracts, the other relaxes. The most common examples of these types of muscles are biceps and triceps. This movement eventually helps manage and regulate the movement of the agonist muscles. Thus, these muscles work in opposition to each other, in terms of movement.
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