Muscles bring about movement at a ❌; most movements are produced by the co-ordinated action of ❌ muscles. Muscles ❌, pulling on the bone and so moving the joint. Muscles can only ❌, they can't ❌, so at least ❌ muscles are needed to move a bone to and fro. A pair of muscles that work in this way are described as ❌. A muscle that contracts to cause ❌ of a joint is called an ❌; the corresponding ❌ muscle contracts to reverse the movement.
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antagonistic
antagonistic
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