Know Your Nerve Fibers
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Questions and Answers

Which type of nerve fiber is covered with a fatty insulating layer called myelin?

  • Unmyelinated nerve fiber
  • Axon
  • Myelinated nerve fiber (correct)
  • Neuron
  • What are the small un-insulated gaps called in an unmyelinated nerve fiber?

  • Myelin
  • Neurons
  • Nodes of Ranvier (correct)
  • Axons
  • What are the two factors that affect the speed of propagation of the action potential?

  • Axons and neurons
  • Membranes and core
  • Resistance and capacitance (correct)
  • Myelin and nodes of Ranvier
  • What happens to the propagation velocity if there is a decrease in resistance within the core of the membrane?

    <p>It increases</p> Signup and view all the answers

    How does the charge stored in a myelinated section of a nerve fiber compare to that of an unmyelinated fiber of the same diameter?

    <p>The charge stored is lower in myelinated fibers</p> Signup and view all the answers

    Which type of conduction occurs when the action potential jumps from one node to the next?

    <p>Saltatory conduction</p> Signup and view all the answers

    What is the propagation velocity of unmyelinated axons?

    <p>20 to 50 m/sec</p> Signup and view all the answers

    What is the time constant of a membrane determined by?

    <p>Resistance and capacitance</p> Signup and view all the answers

    What is the velocity of conduction inversely related to?

    <p>Time constant of the membrane</p> Signup and view all the answers

    What is the record of the potentials from muscles during movement called?

    <p>Electromyogram (EMG)</p> Signup and view all the answers

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