Biomed 100 Practice Quiz
Chapter 9, Spring 2008
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  1. Voluntary contractions of facial muscles requires
    1. conduction through a cranial nerve
      2.
    2. conduction through a spinal nerve
    3. both A. and B.
    4. none of the above

  2. Which one of the following is most oriented toward supportive functions, as opposed to direct involvement in nerve conduction and transmission?
    1. axons
    2. dendrites
    3. neuroglia ("glia")
      4.
    4. all of the above
    5. none of the above

  3. A typical nerve
    1. is a bundle of many cell bodies
    2. is a bundle of many parallel, independent axons
      3.
    3. is a bundle of neuroglia arranged in concentric "rings"
    4. contains many neurons arranged in series, where one stimulates the next

  4. what is the total number of cranial nerves and spinal nerves in the body (grand total)?
    1. 12
    2. 24
    3. 62
    4. 86
      5.

  5. It is the primary function of _?_ to convert stimuli into electrical signals.
    1. synapses
    2. neuroglia
    3. receptors
      4.
    4. effectors
    5. cranial nerves

  6. Most neurons have
    1. one dendrite and one axon
    2. one dendrite and many axons
    3. one axon and many dendrites
      4.
    4. many axons and many dendrites

  7. Given the key: 1 = axon, 2 = dendrites, 3 = cell body; what is the correct sequence of structures through which signals pass in most neurons?
    1. 1-2-3
    2. 2-1-3
    3. 2-3-1
      4.
    4. 3-1-2
    5. 3-2-1

  8. In a resting (nonconducting) neuron,
    1. there are slightly more positive charges inside the cell than outside the cell
    2. there are slightly more positive charges outside the cell than inside the cell
      3.
    3. the number of positive charges inside the cell is equal to the number of positive charges outside the cell
    4. there are no charges inside or outside the cell

  9. During an action potential,
    1. sodium becomes negative temporarily
    2. potassium becomes negative temporarily
    3. the neuron creates concentration gradients for sodium and potassium ions
    4. sodium and potassium ions move in accordance with pre-existing concentration gradients
      5.

  10. During an action potential, at any point on an axon,
    1. sodium channels (gates) open before potassium channels open
    2. opening of sodium channels allow sodium ions to flow into the axon
    3. opening of sodium channels (gates) results in the axon interior becoming more electrically positive
    4. all of the above
      5.
    5. none of the above

  11. Opening of _?_ channels (gates) results in neurons and muscle fibers (including heart muscle fibers), becoming more negative inside.
    1. sodium (Na+)
    2. potassium (K+)
      3.
    3. calcium (Ca++)
    4. all of the above
    5. none of the above

  12. In the axons of neurons, action potentials
    1. include "slow" calcium channels
    2. increase in voltage (intensity) when the stimulus strength is increased
    3. occur as "all-or-none" events
      4.
    4. both A. and B.
    5. both A. and C.

  13. What type of neuron is more concentrated in the central nervous system than in nerves?
    1. sensory neuron
    2. interneuron
      3.
    3. motor neuron
    4. all of the above are more concentrated in the central nervous system than in nerves
    5. none of the above are more concentrated in the central nervous system than in nerves

  14. Which one of the following is not true of the cerebral cortex?
    1. is a relatively thin layer on the outer surface of the cerebrum
    2. is the first part of the brain to receive sensory signals that were produced in sensory organs
      3.
    3. is the site of consciousness, cognition, etc.
    4. is necessary for generation of signals that stimulate voluntary muscles

  15. Which one of the following occurs in the left cerebral hemisphere of most individuals?
    1. generation of signals that control voluntary muscles on right side of body
    2. generation of signals that control voluntary muscles on left side of body
    3. generation of signals that control voluntary muscles necessary for speech
    4. both A. and B.
    5. both A. and C.
      6.

  16. The cerebral cortex does not contain highly-developed _?_ areas.
    1. sensory
    2. reflex
    3. motor
    4. association

  17. What is the function of the corpus callosum?
    1. "filter" sensory input and remove unimportant signals
    2. intelligence, learning, problem solving, etc.
    3. connect right cerebral hemisphere to left cerebral hemisphere
      4.
    4. maintain blood pressure, breathing movements, etc.
    5. provide "corrective feedback" that enhances balance and coordination

  18. Which part of the brain must be functional for a person to stay alive (whether or not conscious)?
    1. cerebrum
    2. cerebellum
    3. brainstem
    4. diencephalon

  19. A well-documented function of the cerebellum is to
    1. initiate a voluntary movement by sending a "rough draft" of the intended movement into the spinal cord (part of direct motor pathway)
    2. refine a voluntary movement by generating corrective feedback (error-correcting signal) that modifies the pattern of motor activity (part of indirect motor pathway)
    3. both of the above
    4. none of the above

  20. True or false? If a person is dehydrated or if body temperature is increasing or decreasing, the hypothalamus has the potential to initiate certain appropriate bodily responses.
    1. True.
    2. False.