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Muscles 1.07 - Muscles BIOL1005 Fall,2007 Muscle...

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Muscles BIOL 1005 Fall, 2007
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Muscle Composed of cells  with contractile  properties Microfilaments of  actin and myosin Contraction moves  skeleton , blood, or  contents of hollow  organs
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Muscle 3 types: Skeletal Smooth Cardiac 
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Skeletal muscle Striated—alternate  light and dark bands  Due to arrangement  of microfibers within  cells
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Smooth muscle Smaller cells, spindle  shaped Walls of hollow organs,  exocrine glands, blood  vessels Not under conscious  control Involuntary smooth  muscle
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Cardiac muscle Specialized, found only in  heart Branched arrangement Intercalated disks at cell  junctions Not under conscious  control Involuntary striated  muscle
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Skeletal muscle Under conscious control Contract when stimulated by  nerves Striated voluntary muscle Each fiber is a cell Long Many nuclei, mitochondria Cells in bundles Held by loose connective tissue
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Skeletal muscle Major functions Maintain posture Allow movement Respiration (breathing) Body temperature  maintenance
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Muscle gross structure
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