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5 Written questions

5 Matching questions

  1. Polarization
  2. Local Anesthetic
  3. Threshold of excitation
  4. Propagation of the action potential
  5. Electrical gradient
  1. a Drug that attaches to the sodium channels of the membrane, preventing sodium ions from entering and thereby blocking action potentials
  2. b Level of depolarization at which a brief stimulation triggers a rapid, massive electrical change by the membrane
  3. c Transmission of an action potential down an axon
  4. d Electrical gradient across a membrane
  5. e Difference in positive and negative charges across a membrane

5 Multiple choice questions

  1. Jumping of action potentials from one node to another by the flow of positive ions
  2. Ability of certain chemicals to pass more freely than others through a membrane
  3. Brief period following an action potential, when the cell resists the production of further action potentials
  4. Insulating material composed of fats and proteins
  5. Increased polarization across a membrane

5 True/False questions

  1. Relative 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

          

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

          

  3. Resting potentialRapid depolarization and slight reversal of the usual polarization caused by stimulation beyond the threshold

          

  4. Concentration gradientDifference in distribution of ions across a membrane

          

  5. Absolute 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