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WS - Intro to the Nervous System

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WS - Intro to the Nervous System Powered By Docstoc
					Name ______________________________________ Period __________ Date ___________
                           Introduction to the Nervous System
Directions: Number the following terms to indicate the correct pathway of communication by
the nervous system.
   1. _____ Effectors                 4. _____ Stimulus                   6. _____ Sensory receptors
   2. _____ Integration               5. _____ Motor output               7. _____ Response
   3. _____ Sensory input
Directions: Write the letter of the term that best corresponds to the descriptions below.
   8. _____ Main nervous system subdivision that is                    a. Autonomic nervous system
      composed of the brain and spinal cord                            b. Central nervous system
   9. _____ Subdivision of the PNS that controls voluntary             c. Motor division
      activities such as the activation of skeletal muscles
                                                                       d. Peripheral nervous system
   10. _____ Subdivision of the PNS that carries information
       away from the CNS to the effectors                              e. Sensory division
   11. _____ Main nervous system subdivision that is                   f.   Somatic nervous system
       composed of the cranial and spinal nerves
   12. _____ Subdivision of the PNS that regulates the activity of the heart and smooth muscle, and of
       glands; it is also called the involuntary nervous system
   13. _____ A major subdivision of the nervous system that interprets incoming information and
       issues orders
   14. _____ Subdivision of the PNS that conveys information to the CNS
   15. _____ A major subdivision of the nervous system that serves as communication lines, linking all
       parts of the body to the CNS
Directions: Certain activities or sensations are listed below. Write the letter of the specific
receptor type that would be activated by the activity or sensation described. Note that more
than one receptor type may be activated in some cases.
   16. _____ Walking on hot pavement                                   a. Cutaneous receptors
   17. _____ Feeling a pinch                                           b. Free nerve endings
   18. _____ Leaning on a shovel                                       c. Meissner’s corpuscles
   19. _____ Muscle sensations when rowing a boat                      d. Pacinian corpuscles
   20. _____ Feeling a feather tickle your toes                        e. Proprioceptors
   21. _____ Sensory receptors found in the skin, which are specialized to detect temperature,
       pressure changes, and pain
   22. _____ Sensory receptors found in muscle and tendons that detect their degree of stretch
Directions: This exercise emphasizes the difference between neurons and neuroglia. Indicate
which cell type is identified by the following descriptions.
   23. _____ Support, insulate, and protect other cells                a. Neurons
   24. _____ Demonstrate irritability and conductivity                 b. Neuroglia
   25. _____ Release neurotransmitters
   26. _____ Do not detect or respond to stimuli
   27. _____ Are amitotic and have very long cellular extensions
   28. _____ Include Schwann cells, oligodendrocytes, and ependymal cells
   29. _____ Able to divide; therefore are responsible for most brain tumors
   30. _____ Transmit electrical messages from one area of the body to another
   31. _____ What a person is talking about when they say “nerve cells”
Directions: Match the correct anatomical terms of a neuron or its associated structures with
the appropriate description.
   32. _____ Releases neurotransmitters                                         a. Axon
   33. _____ Chemicals released by neurons that stimulate other                 b. Axon terminal
       neurons, muscles, or glands                                              c. Cell body
   34. _____ Gaps in a myelin sheath                                            d. Dendrite
   35. _____ Conducts electrical currents toward the cell body                  e. Myelin sheath
   36. _____ Increases the speed of impulse transmission                        f.   Neurotransmtitters
   37. _____ Location of the nucleus                                            g. Nodes of Ranvier
   38. _____ Generally conducts impulses away from the cell body                h. Synapse
   39. _____ Junction or point of close contact between neurons
Directions: Answer the following questions.
   40. Draw a “typical” neuron in the space below. Include and label the following structures on your
       diagram: cell body, nucleus, dendrites, axon, axon terminals, myelin sheath, Schwann cells, and
       nodes of Ranvier.




   41. Describe myelin. Then explain the importance of the myelin insulation around nerves.



   42. What is the difference between white matter and gray matter?



Directions: Write the letter of the term that best corresponds to the descriptions below.
   43. _____ Neuron that serves as part of the conduction pathway               a. Association neuron
       between sensory and motor neurons                                        b. Motor neuron
   44. _____ Neuron that conducts impulses away from the CNS to                 c. Response
       muscles and glands
                                                                                d. Sensory neuron
   45. _____ Changes, occurring within or outside the body, that affect
       nervous system functioning                                               e. Stimuli
   46. _____ Neuron found in the brain or spinal cord
   47. _____ Neuron that conducts impulses toward the CNS from the
       body periphery
Directions: Write the letter of the term(s) that best corresponds to the descriptions below.
   48. _____ All neuroglia found in the CNS                                     a. Astrocytes
   49. _____ All neuroglia found in the PNS                                     b. Ependymal cells
   50. _____ Most common neuroglial cell in the CNS                             c. Microglial cells
   51. _____ Protect and cushion nerve fibers in the PNS                        d. Oligodendrocytes
   52. _____ Ciliated neuroglia that circulate cerebrospinal fluid              e. Satellite cells
   53. _____ Connect neurons to capillaries in the brain and spinal cord        f.   Schwann cells
   54. _____ Phagocytes in the CNS, cleaning up bacteria and dead brain cells
   55. _____ Neuroglia that help control the chemical environment of the brain and spinal cord
   56. _____ Specialized cells that myelinate the fibers of neurons found in the PNS
   57. _____ Specialized cells that myelinate the fibers of neurons found in the CNS

				
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