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5 Written questions

5 Matching questions

  1. Local Anesthetic
  2. Refractory period
  3. Myelinated axons
  4. Threshold of excitation
  5. Propagation of the action potential
  1. a Brief period following an action potential, when the cell resists the production of further action potentials
  2. b Level of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane
  3. c Drug that attaches to the sodium channels of the membrane, preventing sodium ions from entering and thereby blocking action potentials
  4. d Transmission of an action potential down an axon
  5. e Axon covered with a myelin sheath

5 Multiple choice questions

  1. Membrane potential that varies in magnitude and does not follow the all-or-none law
  2. Time immediately after an action potential, when the sodium gates close and the membrane cannot produce an action potential in response to stimulation of any intensity
  3. Time after the absolute refractory period, when potassium gates remain open wider than usual, requiring a stronger than usual stimulus to initiate an action potential
  4. Rapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold
  5. Principle stating that the size, amplitude, and velocity of the action potential are independent of the intensity of the stimulus that initiated it

5 True/False questions

  1. PolarizationIncreased polarization across a membrane


  2. HyperpolarizationElectrical gradient across a membrane


  3. Local neuronsSmall neuron with no axon or a very short one


  4. Concentration gradientDifference in positive and negative charges across a membrane


  5. Saltary conductionJumping of action potentials from one node to another by the flow of positive ions


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