Biomed 100 Practice Quiz
Chapter 9, Spring 2007
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    1. The peripheral nervous system...
      1. serves as the connection between the central nervous system and body parts such as the hands, internal organs, etc.
      2. is composed of 86 nerves
      3. includes sensory neurons and motor neurons
      4. all of the above
        5.
      5. none of the above

    2. In a nerve action potential, when sodium gates open...
      1. sodium ions flow into the cell, causing the interior of the axon to become more positive
        2.
      2. sodium ions flow into the cell, causing the interior of the axon to become more negative
      3. sodium ions flow out of the cell, causing the interior of the axon to become more positive
      4. sodium ions flow out of the cell, causing the interior of the axon to become more negative

    3. In a nerve action potential, when potassium gates open...
      1. potassium ions flow into the cell, causing the interior of the axon to become more positive
      2. potassium ions flow into the cell, causing the interior of the axon to become more negative
      3. potassium ions flow out of the cell, causing the interior of the axon to become more positive
      4. potassium ions flow out of the cell, causing the interior of the axon to become more negative
        5.

    4. The function of dendrites is...
      1. to collect signals and carry them toward the cell body.
        2.
      2. to carry signals short distances away from the cell body.
      3. to carry signals long distances away from the cell body.
      4. could be any of the above, depending on the type of neuron

    5. White matter...
      1. is found only in the peripheral nervous system.
      2. contains large numbers of cell bodies.
      3. contains large amounts of myelin, a substance that accelerates the passage of action potentials through axons.
        4.
      4. both A. and B.
      5. both A. and C.

    6. In most neurons...
      1. there are more dendrites than axons.
        2.
      2. there are more axons than dendrites.
      3. axons and dendrites are equal in number.

    7. Action potentials (nerve impulses) travel most rapidly through...
      1. small diameter, myelinated axons.
      2. large diameter, myelinated axons.
        3.
      3. small diameter, unmyelinated axons.
      4. large diameter, unmyelinated axons.

    8. Which one of the following is not considered part of the central nervous system?
      1. brain
      2. cranial nerves
        3.
      3. spinal cord

    9. The cerebral hemispheres are...
      1. connected to each other by fibers called meninges
      2. connected to each other by fibers in the brainstem
      3. connected to each other by fibers in the corpus callosum
        4.
      4. not connected to each other

    10. The primary motor areas are located in the _?_ lobes of the cerebrum.
      1. frontal
        2.
      2. parietal
      3. occipital
      4. temporal

    11. The functions of the hypothalamus include...
      1. "higher" brain functions such as complex thought
      2. basic "animal" functions related to feeding and simple behaviors
        3.
      3. playing a vital role in breathing and regulation of blood pressure
      4. all of the above
      5. none of the above

    12. The cerebellum is responsible for...
      1. generating primary motor signals that activate voluntary muscles
      2. generating corrective feedback (correction signals) that promote smooth, efficient movements
        3.
      3. conscious perception of the locations of the limbs in the absence of visual input
      4. all of the above
      5. none of the above

    13. The peripheral nervous system contains a total of _?_ cranial and spinal nerves.
      1. 12
      2. 31
      3. 86
        4.
      4. millions

    14. Complex, abstract thought occur mainly in the
      1. thalamus
      2. medulla oblongata
      3. white matter of diencephalon and cerebellum
      4. association areas of cerebral cortex of each cerebral hemisphere
        5.

    15. Which one of the following is not a function of one of the vital centers in the medulla oblongata of the brainstem?
      1. establish rate and depth of breathing
      2. regulate heart rate and strength of contraction
      3. filter incoming (sensory) signals and relay some to cerebral cortex
        4.
      4. control blood pressure by regulating contraction of smooth muscle of vessels