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The muscles we have in our body are divided into three classes of muscles: cardiac, smooth, and skeletal. Usually, when we think of muscular system we often only remember the skeletal muscles because they make up what is recognized as the muscular system. The muscular system, composed of over 600 muscles, come in a variety of shapes and forms. Diffrences between each muscle are recognized by location, function, structure, and the way they are contracted. Muscle-Bone interactions LEVER SYSTEM A lever is a rigid bar on which a given load is moved with supporting help from a fulcrum. A fulcrum is a fixedpoint on which lever can move in diffrent ways or angles. Flexors Flexors bend at the joint, decreasing the interior angle of the joint «put graphic of this here». The «bracius» humorous, or bicep, is a flexor of the elbow joint, bringing the fist towards the shoulder. If a flexor appears in either the wrist or ankle joints, it becomes a plantarflexor «try to put a graphic of this too». Extendors Opposites of flexors, extensors unbend at the joint, increasing the interior angle «graphic here, possibly the same as that above». The «tracius» humorous, or tricep, is an extensor of the elbow joint, taking the fist farther away from the shoulder. If an extensor is found in the wrist or ankle joints, it becomes a dorsiflexor «graphic here, again maybe the same as above». Abductors Abductors take away from the body, like lifting the arm to the side. Abdmeans to take away, like abduct and abdicate. Spreading out your fingers uses abductors, because you are taking away your fingers from an imaginary line running down your arm «graphic». Adductors Adductors, the opposites of abductors, move toward the body. Add- means to increase or include. By lowing an arm raised to the side, or moving your fingers together while keeping them straight, your muscles are adducting. «graphic» Back to the top.