ZOO Ch. 10, 11, 12 self quizzes.docx

False 22 unmyelinated neurons conduct signals by

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False 22. Unmyelinated neurons conduct signals by? Generating a series of action potentials down the length of the axon 23. In a myelinated fiber, only the initial segment in the trigger zone has voltage-regulated channels? False 24. Some__ neurons are specialized to detect stimuli, whereas__ neurons send signals to the effectors of the nervous system? Afferent; efferent 25. Which of the following ions has the greatest influence on the resting membrane potential? Potassium 26. All of the following are typical characteristics of neurotransmitters EXCEPT? They are released into the bloodstream before reaching the postsynaptic cell 27. When the voltage of a plasma membrane shifts from +35mV towards 0mV, the cell is? Repolarizing 28. A myelin sheath is composed primarily of? Lipids 29. What is the function of the sensory division of the peripheral nervous system? Carries signals to the central nervous system
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30. (Graph) In the accompanying diagram, which letter represents the threshold that activates an action potential? C 31. Myelination in the peripheral nervous system is produced by? Schwann cells 32. Ependymal cells line the inner cavities of the CNS? True 33. If the potassium leak channels were suddenly blocked in arresting neuron, what would happen to its resting? It would become more positive 34. What is the primary site of a neuron for receiving signals from other neurons? The dendrites 35. Glycine is? An inhibitory neurotransmitter 36. In a neuron, the opening of sodium gates typically leads to? Depolarization of the plasma membrane 37. (Graph) In the accompanying diagram, F represents? Hyperpolarization 38. The following are all types of neuroglia, EXCEPT? Ganglia 39. The term “nerve fiber” refers to a? axon 40. Most neurons have multiple dendrites? True 41. What is the function of a microglia cell? Engulf and remove cellular debris and microorganisms 42. Select the correct response with respect to the visceral motor division. The sympathetic division__. The parasympathetic division? Accelerates heart beat and respiration, inhibits digestive system and urinary system/ slows heart rate and breathing, stimulates digestive and urinary systems 43. Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons. These neurons secrete? Dopamine 44. Which of the following cells are responsible for our inability to treat gliomas with chemotherapy? Astrocytes 45. What is the best way to fully awaken in the morning? Increase the amount of serotonin by surrounding yourself with lots of natural light 46. A traveling wave of excitation is known as? Nerve signal 47. What is the voltage of a resting membrane potential in a neuron? -70mV 48. Why is it important to feed infants less than two years of age a diet high in fat? Myelin is high in lipids, but at birth we contain almost no myelin in our brains 49. Place the following events in synaptic transmission at a cholinergic synapse in order? D,B,C,E,A 50. (neuron) Referring to the following diagram, where is the nerve signal fastest? D Neuron Graph
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  • Fall '08
  • Staff
  • Muscle fascicle, muscle paralysis, Dr. Kandalepas

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