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Muscles are arranged in such a way that whatever one muscle can do, other muscles can reverse. Because of this, muscles are able to bring about an immense variety of movements. Prime mover. The muscle that has the major responsibility for causing a particular movement is called the prime mover. Antagonists. Muscles that oppose or reverse a movement are antagonists; when a prime mover is active, its antagonist is stretched and relaxed. Synergists.
When a muscle acts to move a bone, it's point of origin (which is usually the end of the muscle closest to the axial skeleton)is held fairly stable so that the contraction of the muscle pulls the bone to which it inserts into towards it, in a lever-like action across the joint, which acts as a pivot.very muscle works with another muscle (or several others). The acting muscle is known as the agonist, and the 'partner' muscles are called the antagonists. The antagonist's action is the opposite of the agonist's action, and helps to control the movement and prevent injury.