Lecture 10: Movement Control and Motor Units
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Questions and Answers

Which type of skeletal muscle fiber is generally recruited first during weak contractions?

  • Fast oxidative (Fast fatigue resistant) – Type II
  • Type I Fibres (red fibres)
  • Slow oxidative (Slow fatigue resistant) – Type I (correct)
  • Fast glycolytic (Fast fatiguing) – Type II
  • What gives rise to the differences in maximal shortening velocities between fast and slow muscle fibers?

  • Variances in the size of sarcomeres in the muscle fibers
  • Variations in the number of mitochondria present in the fibers
  • Levels of myoglobin concentration in the muscle fibers
  • Different myosin enzymes with high or low ATPase activities (correct)
  • Which type of muscle fiber has a larger average diameter and produces greater tension but also fatigues more rapidly?

  • Fast oxidative (Fast fatigue resistant) – Type II
  • Slow oxidative (Slow fatigue resistant) – Type I
  • Fast glycolytic (Fast fatiguing) – Type II (correct)
  • Type I Fibres (red fibres)
  • Which factor determines whether slow-oxidative or fast-glycolytic motor units are recruited during muscle contractions?

    <p>Intensity of the contraction</p> Signup and view all the answers

    What characterizes red muscle fibers in terms of myoglobin and mitochondria content?

    <p>Red fibers contain large amounts of myoglobin and mitochondria</p> Signup and view all the answers

    What is the function of the isoform of myosin found in red muscle fibers?

    <p>Low ATPase activity for slower contraction</p> Signup and view all the answers

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