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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.
A antagonist muscle is the muscle that opposes the agonist. So using the same example, during a biceps curl, the triceps is the antagonist muscle. This muscle relaxes as the biceps contracts. A synergist muscle is one that stabilizes a joint around which movement is occurring and helps to create movement. So again with the curl example, the brachialis and brachioradialis are the synergists muscles. They assist the biceps muscle and stabilize the elbow. When dropping the weight back down during a biceps curl exercise, the triceps becomes the agonist muscle and the biceps becomes the antagonist.