Muscle Types

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  • Muscle Types
    • Involuntary (smooth) Muscle
      • Controlled by autonomic NS
      • Contracts slowly & fatigues slowly
      • Short spindle shaped cells, each with a single nucleus
      • Unstriated appearance under microscope
      • Found in intestine walls, iris, arteries, arteriols, cervix & bronchi
      • Involved in movement of materials along internal tubes such as gut
      • Involved in autonoimic reflexes such as pupil dilation / constriction
    • Cardiac Muscle
      • Controlled by autonomic NS but is myogenic
      • Contracts quickly but does not fatigue
      • Roughly quadrangular shaped, with branched fibres
      • Have a single central nucleus
      • Striated appearance under microscope
      • Involved in pumping around the body
    • Voluntary (skeletal) Muscle
      • Controlled by somatic NS
      • Contracts quickly & fatigues quickly
      • Branched cylindrical fibres which are found in the locomotive system
      • Have multinucleate cells
      • Striated appearance under microscope
      • Involved in voluntary movement of bones of the skeleton about the joints

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