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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.
To understand different joint and movement types. To be able to name, draw and label different lever systems. Explain what is meant by mechanical advantage and disadvantage. When one contracts, the other relaxes. The contracting muscle is called the prime mover (agonist) , the relaxing muscle is the antagonist.he muscles pulling the upper leg backwards at the hip joint is the gluteals (the agonist during the drive phase). The muscles pulling the upper leg forwards at the hip joint are the hip flexors (the agonist during the recovery phase). Running (hip joint). The knee joint is a hinge joint.