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5 Written Questions

5 Matching Questions

  1. postsynaptic potentials
  2. Peripheral Nervous System (PNS)
  3. type B fibers
  4. graded potentials
  5. temporal and spatial summation
  1. a -myelinated
    -medium diameter
    -medium speed
    -carry intermediate signals
    -e.g. sensory information, peripheral effectors
  2. b
  3. c also, local potentials

    -changes in transmembrane potential that cannot spread far from site of stimulation
    -any stimulus that opens a gated channel; produces a graded potential
  4. d -all tissue outside the CNS
    -deliver sensory info to the CNS
    -carry motor commands to peripheral tissues and systems
  5. e graded potentials developed in a postsynaptic cell
    -in response to neurotransmitters

5 Multiple Choice Questions

  1. voltage regulated channels -
    -excitable membrane
  2. carries electrical signal (action potential) to target
  3. -dense area of RER and ribosomes (produce neurotransmitters)
    -make neural tissue appear gray (gray matter)
  4. multiple sclerosis -
    - disorder of oligodendrocytes
    -weakness, incoordination, visual impairment, speech disturbances
    -trouble walking up stairs or grasping objects
    -most common among women 20-40
    -autoimmune disorder or viral
    -no cure
    tumors -
    -gliomas
    -multiple neurofibromatosis
  5. -cells that provide brain power
    -most located in brain, spinal cord, autonomic ganglia
    -between sensory and motor neurons

5 True/False Questions

  1. active forcesrefractory period -

    absolute refractory period -
    -sodium channels open or inactivated
    -no action potential possible; gates locked closed

    relative refractory period -
    -membrane potential almost normal
    -resistant to opening but w/ large stimulus can open

          

  2. ion movements and electrical signals

          

  3. unipolar neurons-found in special sensory organs; fairly rare
    -small
    -one dendrite, one axon

          

  4. events at a cholinergic synapse-action potential arrives, depolarizes synaptic knob
    -calcium ions enter synaptic knob, trigger exocytosis of ACh
    -ACh binds to receptors, depolarizes postsynaptic membrane
    -AChE breaks ACh into acetate and choline

          

  5. schwann cellspresynaptic cell - neuron that sends message
    postsynaptic cell - cell that receives message
    synaptic cleft - small gap that separates the presynaptic membrane and the postsynaptic membrane

          

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