NAME: ________________________

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5 Written Questions

5 Matching Questions

  1. Axon hillock
  2. Relative refractory period
  3. Hyperpolarization
  4. Action potential
  5. Propagation of the action potential
  1. a Swelling of the soma, the point where the axon begins
  2. b 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
  3. c Increased polarization across a membrane
  4. d Rapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold
  5. e Transmission of an action potential down an axon

5 Multiple Choice Questions

  1. Membrane channel whose permeability to sodium (or some other ion) depends on the voltage difference across the membrane
  2. Electrical gradient across a membrane
  3. Difference in positive and negative charges across a membrane
  4. Principle stating that the size, amplitude, and velocity of the action potential are independent of the intensity of the stimulus that initiated it
  5. 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

5 True/False Questions

  1. Threshold of excitationLevel of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane

          

  2. Resting potentialRapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold

          

  3. Local neuronsDrug that attaches to the sodium channels of the membrane, preventing sodium ions from entering and thereby blocking action potentials

          

  4. Concentration gradientDifference in distribution of ions across a membrane

          

  5. Graded potentialsMembrane potential that varies in magnitude and does not follow the all-or-none law

          

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