Muscular system
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Muscular system

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Muscular system Muscular system Presentation Transcript

  • The Muscular System
  • Pump blood (cardiac m.t.)Control blood flow (smooth m.t.)
  • Freeze-fractured muscle fiber…showing the “broken” myofibrils
  • Graded Muscle Responsesa. Muscle contractions vary in strength due to…. 1. Frequency of stimulus
  • 2. Strength of stimulus
  • Ponder this point……..a. The application of the first stimulus did not activate any motor units.b. All motor units are active when the “level 6” stimulus was applied.c. The application of a “level 10” stimulus would result in a stronger contraction than the “level 7 stimulus.”d. Indicate which of the following would be best for lifting heavy objects and which would be best for performing surgery. _________________ size of motor unit averages 1000 muscle cells _________________ size of motor unit averages 14 muscle cells
  • Types of Muscle Fibers
  • Slow twitchmuscle fibers(Type I)
  • Fast twitch (Type II)
  • Type II AType II B
  • These studies and journal articles offer moreinsight on muscle fiber research:High-Intensity Training and Changes in MuscleFiberNature vs. Nurture: Can Exercise Really AlterFiber Type Composition?Effects of Endurance Training on Muscle Fiber