Compléter How the muskuloskeletal systemVersion en ligne How the muskuloskeletal system par Mónica Garrido 1 lever Agonist Fulcrum Resistance first levers levers levers pairs levers second Effort skeletal two joints third relaxes Antagonistic All movements are due to to the joint action of or more muscles . muscles act in the same direction . muscles , working in , work in opposite directions . If one contracts , the other and vice versa . The bones , muscles and involved in producing movement act as a . Three types of exist based on the postion of three elements . : where the force is applied . : where the part to be moved is located . : where the lever is supported . In our body we can find class ( like the one formed by the head and the spinal column ) , class ( like the one formed by the ankle and the leg ) and class ( like the one formed by arm and the forearm ) .
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