Muscle Response and Motor Units Quiz
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Questions and Answers

What is the definition of a motor unit?

  • A group of muscle fibres contracting at once
  • A single muscle fibre and its neural stimulus
  • A cluster of motor neurons innervating a single muscle fibre
  • A single motor neurone and all the muscle fibres it innervates (correct)

    • What is the characteristic of a motor unit?

  • Motor units innervate individual muscle fibres
  • Muscle fibres contract sequentially in a motor unit
  • All the muscle fibres in a motor unit contract at once (correct)
  • Motor units are selectively recruited for single muscle fibres

    • What is a twitch in the context of muscle fibre contraction?

  • The relaxation phase of muscle contraction
  • A sustained muscle contraction
  • The mechanical response of a muscle fibre to a single action potential (correct)
  • The maximum force generated by a muscle fibre

    • What determines the graded muscle response?

    <p>Frequency of neural stimuli</p> Signup and view all the answers

    What is the smallest functional unit of a muscle group?

    <p>The motor unit</p> Signup and view all the answers

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