Muscular system

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Muscular system

  1. 1. The Muscular System
  2. 2. Pump blood (cardiac m.t.)Control blood flow (smooth m.t.)
  3. 3. Freeze-fractured muscle fiber…showing the “broken” myofibrils
  4. 4. Graded Muscle Responsesa. Muscle contractions vary in strength due to…. 1. Frequency of stimulus
  5. 5. 2. Strength of stimulus
  6. 6. 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
  7. 7. Types of Muscle Fibers
  8. 8. Slow twitchmuscle fibers(Type I)
  9. 9. Fast twitch (Type II)
  10. 10. Type II AType II B
  11. 11. 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

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