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Unformatted text preview: 11-19-07 anatomy notes1.Muscular Systema.Skeletal System Tonus-few but continual impulses from CNS to muscles in slight state of contractioni.Function-put the muscles in READY STATE1.Muscles are not completely relaxed, contract on demandii.Variations1.Increased-fear, anxiety, severe emotional distress2.Decreased-during sleepb.Muscular Developmenti.Hypertrophy-increased physical size of muscle, increased number of myofibrils/cell NOT increased muscle cells1.Cause-excessive use and exercise of muscle cellsii.Atrophy-decreased physical size of the muscle; decreased number of myofibrils/cell or loss of muscle cells1.Causesa.Immobilization or lack of usei.When you break a bone-put into a cast so muscle isnt used, grows smallerb.Denervation-caused by spinal cord injuries or a loss of motor nerve inputi.Lack of tonusii.In that time, muscle tissue converted to connective tissuec.Origins, Insertions, and Actionsi.Origin-stationary attachment of a muscle1.less movable endii.Insertion-more movable end of a muscle...
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