Physiology of Peripheral Nerves - Types of Neurons
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Questions and Answers

What is the main difference between myelinated and unmyelinated nerve fibers in terms of nerve impulse conduction?

  • Myelinated fibers conduct nerve impulses more energetically than unmyelinated fibers.
  • Myelinated fibers conduct nerve impulses faster than unmyelinated fibers. (correct)
  • Unmyelinated fibers conduct nerve impulses more efficiently than myelinated fibers.
  • Unmyelinated fibers conduct nerve impulses faster than myelinated fibers.

    • What term is used to describe the conduction of nerve impulses where they jump from one node of Ranvier to another in myelinated nerve fibers?

  • Node-to-node conduction
  • Saltatory conduction (correct)
  • Jumping conduction
  • Sequential conduction

    • What factor determines the effectiveness of a stimulus on a nerve fiber?

  • Sourness of the stimulus
  • Intensity of the stimulus (correct)
  • Duration of the stimulus
  • Color of the stimulus

    • What is the term used for the minimal intensity of a stimulus that produces a nerve impulse in a nerve fiber?

    <p>Threshold stimulus</p> Signup and view all the answers

    What law does a single nerve fiber obey in response to stimuli?

    <p>All or None Law</p> Signup and view all the answers

    What characterizes the mixed nerve that consists of many nerve fibers?

    <p>Different diameters and excitability</p> Signup and view all the answers

    Which type of nerve fibers are most susceptible to local anesthetic drugs?

    <p>Group C</p> Signup and view all the answers

    What type of potential change occurs when using cathodal currents for nerve stimulation?

    <p>Partial depolarization</p> Signup and view all the answers

    Which group of nerve fibers is most sensitive to pressure?

    <p>Alpha (α)</p> Signup and view all the answers

    What effect does hyperpolarization have on the excitability of a nerve?

    <p>Decreases excitability</p> Signup and view all the answers

    Which type of nerve fibers have the highest speeds of conduction?

    <p>Group A</p> Signup and view all the answers

    What leads to an increase in both K+ efflux & Cl- influx in a nerve membrane?

    <p>-ve charges at the outer surface</p> Signup and view all the answers

    What is the mechanism of nerve impulse conduction in unmyelinated nerve fibers?

    <p>Local current flow between the depolarized area and surrounding areas</p> Signup and view all the answers

    Which type of neuron carries orders from the CNS to organs?

    <p>Motor (Efferent) neuron</p> Signup and view all the answers

    What is the role of myelination in nerve impulse conduction?

    <p>Increases the speed of propagation</p> Signup and view all the answers

    Which type of neuron is a postganglionic neuron?

    <p>Non-myelinated nerve fiber neuron</p> Signup and view all the answers

    What happens during repolarization in nerve impulse conduction?

    <p>Partial depolarization of surrounding sites</p> Signup and view all the answers

    How does the speed of propagation relate to the diameter of the nerve fiber?

    <p>Speed is directly proportional to diameter</p> Signup and view all the answers

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