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5 Written questions

5 Matching questions

  1. Voltage-gated channels
  2. Threshold of excitation
  3. Myelin
  4. Myelinated axons
  5. Selectively Permeable
  1. a Axon covered with a myelin sheath
  2. b Insulating material composed of fats and proteins
  3. c Membrane channel whose permeability to sodium (or some other ion) depends on the voltage difference across the membrane
  4. d Level of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane
  5. e Ability of certain chemicals to pass more freely than others through a membrane

5 Multiple choice questions

  1. Principle stating that the size, amplitude, and velocity of the action potential are independent of the intensity of the stimulus that initiated it
  2. Difference in positive and negative charges across a membrane
  3. Increased polarization across a membrane
  4. Brief period following an action potential, when the cell resists the production of further action potentials
  5. Swelling of the soma, the point where the axon begins

5 True/False questions

  1. Concentration gradientDifference in distribution of ions across a membrane


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


  3. Sodium-potassium pumpMechanism that actively transports three sodium ions out of the cell while simultaneously drawing in two potassium ions


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


  5. Saltary conductionElectrical gradient across a membrane