How are we able to flex muscles without moving the associated limb?
In: 20
Muscles generally come in pairs, especially for limbs, bicep/tricep, for instance. When you flex one, the opposite muscle pulls at the same time, to keep the limb still.
Muscles can only pull. If you relax one, the other one pulls the limb in the direction of that muscle. So if you relax your bicep, your tricep pulls the forearm back, at the elbow.
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