NAME: ________________________

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5 Written Questions

5 Matching Questions

  1. Graded potentials
  2. Local neurons
  3. Sodium-potassium pump
  4. Hyperpolarization
  5. Electrical gradient
  1. a Mechanism that actively transports three sodium ions out of the cell while simultaneously drawing in two potassium ions
  2. b Difference in positive and negative charges across a membrane
  3. c Increased polarization across a membrane
  4. d Membrane potential that varies in magnitude and does not follow the all-or-none law
  5. e Small neuron with no axon or a very short one

5 Multiple Choice Questions

  1. Electrical gradient across a membrane
  2. Rapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold
  3. Membrane channel whose permeability to sodium (or some other ion) depends on the voltage difference across the membrane
  4. Swelling of the soma, the point where the axon begins
  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. Selectively PermeableAbility of certain chemicals to pass more freely than others through a membrane

          

  2. Myelinated axonsInsulating material composed of fats and proteins

          

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

          

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

          

  5. Relative refractory periodTime 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

          

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