Chapter 11: Nervous System And Action Potentials

15 Questions | Total Attempts: 76

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Chapter 11: Nervous System And Action Potentials

Questions on Chapter 11.


Questions and Answers
  • 1. 
    Concerning concentration differences across the plasma membrane (at rest), there is
    • A. 

      More K+ and Na+ outside the cell than inside

    • B. 

      More K+ and Na+ inside the cell than outside

    • C. 

      More K+ outside the cell than inside and more Na+ inside the cell than outside

    • D. 

      More K+ inside the cell than outside and more Na+ outside the cell than inside. 

  • 2. 
    Which of these are open on an undisturbed cell? 
    • A. 

      Sodium-gated channels

    • B. 

      Potassium-gated channels

    • C. 

      Potassium leak channels

    • D. 

      Chloride-gated channels

  • 3. 
    Summation
    • A. 

      Is caused by combining two or more graded potentials

    • B. 

      Can occur when two action potentials arrive from different dendrites

    • C. 

      Results in an action potential if it reaches the threshold potential

    • D. 

      Can occur when two action potentials arrive in close succession

    • E. 

      All of these are correct. 

  • 4. 
    Hyperpolarization can happen when
    • A. 

      The inside of the cell membrane becomes much more negative

    • B. 

      The inside of the cell becomes much more positive

    • C. 

      K+ gated channels are open

    • D. 

      Na+ gated channels are open

    • E. 

      A and C

    • F. 

      B and D

  • 5. 
    The absolute refractory period 
    • A. 

      Limits how many action potentials can be produced during a given period of time

    • B. 

      Prevents an action potential from starting another action potential at the same point on the plasma membrane. 

    • C. 

      Is the period of time when a strong stimulus can initiate a second action potential. 

    • D. 

      Both a and b are correct

    • E. 

      All of these are correct. 

  • 6. 
    A [Blank]-gated channel involves the binding of acetylcholine to a receptor. 
  • 7. 
    In this picture, which neuron is the postsynaptic cell? 
    • A. 

      Blue

    • B. 

      Green

  • 8. 
    In this picture, which neuron is the presynaptic cell? 
    • A. 

      Blue

    • B. 

      Green

  • 9. 
    Which of the following is probably going to propagate an action potential fastest?
    • A. 

      A thin, unmyelinated axon

    • B. 

      A thin, myelinated axon

    • C. 

      A thick, unmyelinated axon

    • D. 

      A thick, myelinated axon

  • 10. 
    The autonomic nervous system is a two neuron system. 
    • A. 

      True

    • B. 

      False

  • 11. 
    The central nervous system includes (select all that apply): 
    • A. 

      Brain

    • B. 

      Spinal nerves

    • C. 

      Motor neurons

    • D. 

      Spinal cord

  • 12. 
    Afferent means sending action potentials away from the CNS
    • A. 

      True

    • B. 

      False

  • 13. 
    [Blank] are the resident glial cells that help form the blood-brain barrier. 
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