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5 Written Questions

5 Matching Questions

  1. Axon hillock
  2. Concentration gradient
  3. Action potential
  4. Threshold of excitation
  5. Electrical gradient
  1. a Level of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane
  2. b Rapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold
  3. c Difference in positive and negative charges across a membrane
  4. d Difference in distribution of ions across a membrane
  5. e Swelling of the soma, the point where the axon begins

5 Multiple Choice Questions

  1. Jumping of action potentials from one node to another by the flow of positive ions
  2. Insulating material composed of fats and proteins
  3. Increased polarization 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. Transmission of an action potential down an axon

5 True/False Questions

  1. Resting potentialElectrical potential across a membrane when a neuron is not being stimulated

          

  2. Refractory periodTime 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. Graded potentialsRapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold

          

  4. 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

          

  5. Absolute 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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