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5 Written questions

5 Matching questions

  1. Concentration gradient
  2. Local neurons
  3. Voltage-gated channels
  4. Propagation of the action potential
  5. Graded potentials
  1. a Membrane channel whose permeability to sodium (or some other ion) depends on the voltage difference across the membrane
  2. b Membrane potential that varies in magnitude and does not follow the all-or-none law
  3. c Transmission of an action potential down an axon
  4. d Small neuron with no axon or a very short one
  5. e Difference in distribution of ions across 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. Rapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold
  3. Jumping of action potentials from one node to another by the flow of positive ions
  4. Electrical potential across a membrane when a neuron is not being stimulated
  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. Electrical gradientDifference in distribution of ions across a membrane


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


  3. PolarizationElectrical gradient across a membrane


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


  5. Threshold of excitationIncreased polarization across a membrane


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