Motor Units Quiz
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Questions and Answers

What is the main component of a motor unit?

  • Motor neuron (correct)
  • Tendon
  • Capillary
  • Muscle fiber
  • Which type of muscles have many fibers per motor unit?

  • Muscles responsible for quick movement
  • Muscles responsible for fine movement
  • Muscles responsible for complex movement
  • Muscles responsible for gross movement (correct)
  • What is the function of motor unit territory?

  • To concentrate the force of motor units in a specific area
  • To distribute the force of motor units over a larger area (correct)
  • To increase the speed of muscle contraction
  • To decrease the blood supply to muscle fibers
  • Which motor unit type is named after the fiber type it innervates?

    <p>Type II</p> Signup and view all the answers

    What is the relationship between motoneuron soma size and fiber type?

    <p>Type IIX/b &gt; type IIA &gt; type I</p> Signup and view all the answers

    Which fiber type is fatigue resistant?

    <p>Type I (Slow Oxidative)</p> Signup and view all the answers

    What is the main difference between type I and type II muscle fibers?

    <p>Contraction speed and oxidative capacity</p> Signup and view all the answers

    What determines the conduction velocity of a nerve signal?

    <p>Axon diameter</p> Signup and view all the answers

    Which type of muscle fiber has the fastest contraction speed?

    <p>Type IIX</p> Signup and view all the answers

    What is the main difference in ATP breakdown between type IIA and type IIX fibers?

    <p>Type IIX fibers break down ATP faster</p> Signup and view all the answers

    What determines the cross-bridge cycle speed in muscle fibers?

    <p>Myosin ATPase activity</p> Signup and view all the answers

    Which type of muscle fiber has the highest specific force?

    <p>Type IIX</p> Signup and view all the answers

    What is the main fuel for non-oxidative metabolism in muscle fibers?

    <p>Carbohydrates</p> Signup and view all the answers

    What determines the contraction speed of myosin heavy chain in muscle fibers?

    <p>Myosin ATPase activity</p> Signup and view all the answers

    What determines the ability of muscle fibers to undergo rapid and large release and uptake of calcium?

    <p>Sarcoplasmic reticulum size</p> Signup and view all the answers

    What type of muscle fiber has the highest peak power and at what velocity does it occur?

    <p>Type IIX at fast velocity</p> Signup and view all the answers

    What type of training can increase the size of all fiber types in a muscle?

    <p>Hypertrophic training</p> Signup and view all the answers

    What is the test whereby one pedals as hard as possible against a given or a set force?

    <p>Windgate test</p> Signup and view all the answers

    What type of muscle fibers have similar myofilament and myofibrillar density to slow twitch fibers?

    <p>Type IIX</p> Signup and view all the answers

    What type of fibers have the ability to generate more peak force at a faster rate?

    <p>Type IIX</p> Signup and view all the answers

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