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Questions and Answers
What is the alpha motor neuron's diameter?
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?
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?
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?
What is the main characteristic of action potentials?
Where does the alpha motor neuron send projections?
Where does the alpha motor neuron send projections?
What is the first step in a nerve conduction study?
What is the first step in a nerve conduction study?
Which nerves are the most easily studied in the upper extremity?
Which nerves are the most easily studied in the upper extremity?
Where are the recording electrodes placed for sensory nerve studies?
Where are the recording electrodes placed for sensory nerve studies?
What is the purpose of performing needle electromyography (EMG) examination after nerve conduction studies (NCSs)?
What is the purpose of performing needle electromyography (EMG) examination after nerve conduction studies (NCSs)?
What type of nerve can be easily stimulated and brought to action potential with a brief electrical pulse applied to the overlying skin?
What type of nerve can be easily stimulated and brought to action potential with a brief electrical pulse applied to the overlying skin?
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