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Motor Units and Action Potential Quiz
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Motor Units and Action Potential Quiz

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@HandyBliss

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Questions and Answers

What is the alpha motor neuron's diameter?

  • 20–30 μm
  • 5–10 μm
  • 30–40 μm
  • 10–20 μm (correct)
  • What does the all-or-none law state about action potentials?

  • Any stimulus will cause a partial response
  • Only suprathreshold stimuli produce a response
  • Threshold stimuli produce a partial response
  • Any subthreshold stimulus will cause nothing (correct)
  • What is a motor unit?

  • A bundle of nerves in the spinal cord
  • A group of muscle fibers innervated by a single alpha motor neuron (correct)
  • A type of action potential
  • A single muscle fiber
  • What is the main characteristic of action potentials?

    <p>Sudden and brief changes in electrical potential</p> Signup and view all the answers

    Where does the alpha motor neuron send projections?

    <p>Ipsilaterally out the ventral and dorsal rami</p> Signup and view all the answers

    What is the first step in a nerve conduction study?

    <p>Taking a detailed history</p> Signup and view all the answers

    Which nerves are the most easily studied in the upper extremity?

    <p>Median and radial nerves</p> Signup and view all the answers

    Where are the recording electrodes placed for sensory nerve studies?

    <p>Over the sensory nerve</p> Signup and view all the answers

    What is the purpose of performing needle electromyography (EMG) examination after nerve conduction studies (NCSs)?

    <p>To plan and interpret the needle examination based on NCS findings</p> Signup and view all the answers

    What type of nerve can be easily stimulated and brought to action potential with a brief electrical pulse applied to the overlying skin?

    <p>Peripheral nerve</p> Signup and view all the answers

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