Chapter 12

13 Questions | Total Attempts: 16

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Tissue Quizzes & Trivia

Nervous tissues


Questions and Answers
  • 1. 
    Nervous system is composed of neurons and neuroglia.  What is its main function?
    • A. 

      Movement

    • B. 

      Communication

  • 2. 
    Forms myelin in the brain and spinal cord:
    • A. 

      Astrocytes

    • B. 

      Ependymal Cells

    • C. 

      Oligodendrocytes

    • D. 

      Schwann cells

  • 3. 
    Astrocytes do this:
    • A. 

      Maintain chemical composition of brain

    • B. 

      Produce myelin

    • C. 

      Secrete cerebrospinal fluid

  • 4. 
    Point where the cell body branches off and where action potential is generated:
    • A. 

      Schwann cells

    • B. 

      Dentrites

    • C. 

      Gray matter

    • D. 

      Axon hillock

  • 5. 
    Type of matter that has unmyelinated nerve tissue in the CNS
    • A. 

      White matter

    • B. 

      Gray matter

  • 6. 
    These neurons have an axon and a dendrite rising from a single short fiber extending from side of cell body:
    • A. 

      Multipolar

    • B. 

      Unipolar

    • C. 

      Bipolar

  • 7. 
    Neuron which conucts impulses from peripheral receptos to the CNS
    • A. 

      Motor neurons

    • B. 

      Interneurons

    • C. 

      Sensory neurons

  • 8. 
    Cell membrane potential -- is it positive or negative outside the cell because of sodium ions?
    • A. 

      Positive

    • B. 

      Negative

  • 9. 
    In the resting potential, is there a greater concentration of potassium ions inside or outside the membrane?
    • A. 

      Inside

    • B. 

      Outside

  • 10. 
    At which point during action potential do the sodium channels open?
    • A. 

      Threshold potential

    • B. 

      Repolarization

  • 11. 
    What is the threshold potential?
    • A. 

      +55 mV

    • B. 

      20 mV

    • C. 

      -55 mV

    • D. 

      70 mV

  • 12. 
    Neurotransmitters that increase post synaptic membrane permeability to sodium ions may trigger impulses because they are:
    • A. 

      Salatory

    • B. 

      Excitatory

    • C. 

      Inhibitory

  • 13. 
    Neurotransmitters that decrease membrane permeability to sodium ions reducing the changes it will reach threshold are:
    • A. 

      Salatory

    • B. 

      Excitory

    • C. 

      Inhibitory