Mastering Nerve Cell Electrical Potentials
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Questions and Answers

Which of the following is the main component of cell membranes?

  • Lipid
  • Hydrocarbon chain
  • Phosphate group
  • Phospholipid bilayer (correct)
  • What is the capacitance of cell membranes?

  • 10-4 Fm-2
  • 10-3 Fm-2
  • 10-1 Fm-2
  • 10-2 Fm-2 (correct)
  • What is the resting membrane potential of nerve cells?

  • -50 to -70 mV
  • -70 to -90 mV (correct)
  • -90 to -110 mV
  • -30 to -50 mV
  • Which ion is high in the extracellular fluid?

    <p>Sodium (Na+)</p> Signup and view all the answers

    Which ion is high in the intercellular fluid?

    <p>Potassium (K+)</p> Signup and view all the answers

    What happens to the cell membrane permeability during an active state?

    <p>Increases suddenly to Sodium</p> Signup and view all the answers

    What is the peak value of the action potential during an active state?

    <p>+40 mV</p> Signup and view all the answers

    What is the duration of the action potential peak?

    <p>0.3 ms</p> Signup and view all the answers

    What is the shape and peak size of the action potential dependent on?

    <p>None of the above</p> Signup and view all the answers

    What is actively pumped across the membrane during sodium-potassium pumping?

    <p>Sodium (Na+)</p> Signup and view all the answers

    Which process consumes energy and takes about 50ms to restore the resting Na+ and K+ concentrations?

    <p>Pump reestablishment of ions</p> Signup and view all the answers

    What is the critical threshold value for the response of an axon to a stimulus?

    <p>-55 mV</p> Signup and view all the answers

    What is the name given to the analog network of resistors and capacitors in the axon?

    <p>RC network</p> Signup and view all the answers

    What happens to the changes in potential difference across the capacitors as one goes farther from the stimulus?

    <p>They decrease in magnitude</p> Signup and view all the answers

    What is the potential difference reached by a stimulus above the threshold level?

    <p>+50 mV</p> Signup and view all the answers

    What is the signal conduction velocity directly proportional to?

    <p>Axon diameter</p> Signup and view all the answers

    What is the signal conduction velocity inversely proportional to?

    <p>Capacitance</p> Signup and view all the answers

    What is the name of the process that gradually changes the potential difference across the capacitors?

    <p>Capacitor charging</p> Signup and view all the answers

    What is the name of the current pulse associated with an active potential that travels the length of the axon without attenuation?

    <p>Action potential</p> Signup and view all the answers

    What is the name of the process that gradually reestablishes the resting Na+ and K+ concentrations?

    <p>Pump reestablishment of ions</p> Signup and view all the answers

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