Motor Units Quiz
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Questions and Answers

What does a motor unit consist of?

  • A somatic motoneuron and all the muscle fibers it innervates (correct)
  • A single muscle fiber and its associated capillaries
  • Multiple somatic motoneurons and a single muscle fiber
  • A motor neuron and its surrounding connective tissue

    • How does the number of fibers per motor unit differ for muscles responsible for gross movement and fine/complex movement?

  • The number of fibers per motor unit is unrelated to the type of movement
  • Muscles responsible for gross movement have many fibers per motor unit, while muscles responsible for fine/complex movement have few fibers per motor unit (correct)
  • Muscles responsible for gross movement have few fibers per motor unit, while muscles responsible for fine/complex movement have many fibers per motor unit
  • Both types of muscles have the same number of fibers per motor unit

    • What does the distribution of fibers of different motor units across a larger area within a muscle allow?

  • The force of the motor units to be independent of each other, resulting in unpredictable contractions
  • The force of the motor units to be concentrated in one area, resulting in a stronger contraction and greater force on the tendon
  • The force of the motor units to be distributed over a larger area, resulting in a smoother contraction and more equal force on the tendon (correct)
  • The force of the motor units to be isolated, resulting in an uneven contraction and force on the tendon

    • What is the function of the intermingling of fibers of different motor units within a muscle?

    <p>It allows the active and inactive fibers to share metabolites and capillaries, which may help delay muscle fatigue</p> Signup and view all the answers

    What does each motor unit innervate/activate?

    <p>A single muscle fiber type</p> Signup and view all the answers

    What does a motor unit consist of?

    <p>Somatic motoneuron and all the muscle fibers it innervates</p> Signup and view all the answers

    What is the function of the intermingling of fibers of different motor units within a muscle?

    <p>To distribute the force of the motor units over a larger area</p> Signup and view all the answers

    What does each axon collateral of a motoneuron serve?

    <p>One muscle fiber</p> Signup and view all the answers

    How does the number of fibers per motor unit differ for muscles responsible for gross movement and fine/complex movement?

    <p>Muscles responsible for gross movement have many fibers per motor unit, while muscles responsible for fine/complex movement have few fibers per motor unit</p> Signup and view all the answers

    What does the distribution of fibers of different motor units across a larger area within a muscle allow?

    <p>The force of the motor units to be distributed over a larger area</p> Signup and view all the answers

    Study Notes

    Motor Unit Structure

    • A motor unit consists of a motoneuron and all the muscle fibers it innervates.
    • Each motor unit innervates multiple muscle fibers.

    Motor Unit Distribution

    • The distribution of fibers of different motor units across a larger area within a muscle allows for:
      • Gradual and coordinated muscle contraction.
      • Precise control of movement.

    Motor Unit Composition

    • Muscles responsible for gross movement have motor units with a large number of fibers.
    • Muscles responsible for fine/complex movement have motor units with a small number of fibers.

    Motor Unit Interconnections

    • The intermingling of fibers of different motor units within a muscle allows for:
      • Smooth and coordinated movement.
      • Efficient use of muscle fibers.

    Axon Collaterals

    • Each axon collateral of a motoneuron serves a separate group of muscle fibers.
    • Axon collaterals allow a single motoneuron to innervate multiple motor units.

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    Related Documents

    Module 3, Lecture 17 - Kinesiol 2C03.docx

    Description

    Test your knowledge of motor units with this quiz. Explore the relationship between somatic motoneurons and muscle fibers and understand how the number of fibers per motor unit varies across different muscle types.

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