Bms 333 Exam 2 Neuro

13 Questions | Total Attempts: 82

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Neuro Quizzes & Trivia

Questions and Answers
  • 1. 
    Which of the following best describes a neuron at the resting state?
    • A. 

      Na+-K+ ATPase pumps are not active

    • B. 

      The resting membrane potential is about +65 mV

    • C. 

      K+ ions leak out of a neuron via nongated K+ channels

    • D. 

      Voltage-gated K+ channels are open

    • E. 

      The resting state represents the relative refractory period

  • 2. 
    A local anesthetics, lidocane, prevents generation of action potential by inactivating:
    • A. 

      Receptors for gamma aminobutylic acid (GABA)

    • B. 

      Nongated Na+ channels

    • C. 

      Voltage-gated Ca++ channels

    • D. 

      Voltage-gated Na+ channels

    • E. 

      Release of neurotransmitter Ach

  • 3. 
    Astrocytes:
    • A. 

      Form choroid plexus that produce cerebrospinal fluid

    • B. 

      Transport glucose from capillaries to neurons

    • C. 

      Give rise to perivascular end feet in the dorsal root ganglion

    • D. 

      Stop dividing shortly after birth

    • E. 

      Promote intercellular accumulation of neurotransmitter glutamate

  • 4. 
    A lesion of the lateral funiculus is likely to affect:
    • A. 

      Central canal

    • B. 

      Neuronal perikarya

    • C. 

      Ependymal cells

    • D. 

      Schwann cells

    • E. 

      Oligodendrocytes

  • 5. 
    When an excitatory synapse 'A' and inhibitory synapse 'B' are stimulated simultaneously, the postsynaptic neuron is likely to generate:
    • A. 

      An excitatory postsynaptic potential only

    • B. 

      An inhibitory poststynaptic potential only

    • C. 

      No obvious overall changes in membrane potential

    • D. 

      Hyperpolarizing potential

    • E. 

      An action potential

  • 6. 
    What do you expect to see in a dog with a large lesion affecting the intermediate substance of teh spinal cord?
    • A. 

      Presence of quadriceps reflex

    • B. 

      Absence of quadriceps reflex

  • 7. 
    Demyelination of axon is likely to result in:
    • A. 

      Slight increase in conduction velocity of action potential

    • B. 

      Decreased conduction velocity to the speed typically seen in nonmyelinated nerve fibers

    • C. 

      A loss of conduction of action potentials as local currents cannot reach the voltage-gated Na+ and K+ channels

    • D. 

      Increased conduction velocity due to a loss of resistance imposed by axonal plasma membrane

    • E. 

      No apparent change in conduction speed as voltage-gated Na+ and K+ channels are still available in the demyelinated area

  • 8. 
    Which of the following is affected in a dog with tic paralysis?
    • A. 

      Sensory neurons in the dorsal horn

    • B. 

      Postsynaptic acetycholine receptors

    • C. 

      Release of Ach at the neuromuscular junction

    • D. 

      Release of glycine from the pre-synaptic site

    • E. 

      Motor neurons in the ventral horn

  • 9. 
    Which statement is true about the neuromuscular synapse?
    • A. 

      Nerve fibers that form the neuromuscular synapse leave the spinal cord via the dorsal root

    • B. 

      Terminal branches of the motor end plate release glutamate

    • C. 

      Neuromuscular synapse is affected by myasthenia gravis

    • D. 

      Postsynaptic membrane has receptors for gamma aminobutylic acid (GABA)

    • E. 

      Axon terminals are covered with astrocytes

  • 10. 
    The pointed portion (depolarization) of an action potential is triggered by:
    • A. 

      Inhibitory postsynaptic potentials

    • B. 

      Na+-K+ ATPase pumps

    • C. 

      Opening of voltage-gated K+ channels

    • D. 

      Inactivation of voltage-gated Na+ channels

    • E. 

      Activation of voltage-gated Na+ channels

  • 11. 
    Which neurotransmitter generates excitatory postsynaptic potential (EPSP) that depolarizes the postsynaptic membrane during synaptic transmission?
    • A. 

      Glycine

    • B. 

      Ach

    • C. 

      GABA

    • D. 

      All of the above

  • 12. 
    A  nerve fiber is:
    • A. 

      Made of an axon and endoneurium

    • B. 

      Made of an axon and Schwann cells

    • C. 

      Made of a myelinated axon and endoneurium

    • D. 

      Made of a nerve fasicle surrounded by perineurium

    • E. 

      Made of an axon and oligodendrocytes

  • 13. 
    For inhibitory graded potential (IPSP) to occur during synaptic transmission, an inhibitory neurotransmitter must bind to the:
    • A. 

      Ligand-gated receptors to trigger influx of Cl-

    • B. 

      Ligand-gated receptors to trigger influx of Na+

    • C. 

      Voltage-gated Na+ channels to trigger influx of Na+

    • D. 

      Voltage-gated K+ channels to trigger influx of K+

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