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5 Written questions

5 Matching questions

  1. Sodium-potassium pump
  2. Myelinated axons
  3. Polarization
  4. Concentration gradient
  5. Absolute refractory period
  1. a Electrical gradient across a membrane
  2. b Difference in distribution of ions across a membrane
  3. c Mechanism that actively transports three sodium ions out of the cell while simultaneously drawing in two potassium ions
  4. d Axon covered with a myelin sheath
  5. e 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 Multiple choice questions

  1. Small neuron with no axon or a very short one
  2. Level of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane
  3. Drug that attaches to the sodium channels of the membrane, preventing sodium ions from entering and thereby blocking action potentials
  4. Difference in positive and negative charges across a membrane
  5. Electrical potential across a membrane when a neuron is not being stimulated

5 True/False questions

  1. Voltage-gated channelsMembrane channel whose permeability to sodium (or some other ion) depends on the voltage difference across the membrane


  2. All-or-none lawRapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold


  3. Saltary conductionElectrical gradient across a membrane


  4. HyperpolarizationIncreased polarization across a membrane


  5. Propagation of the action potentialTransmission of an action potential down an axon