Cell Membrane Potential and Ion Channels
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Questions and Answers

What is the primary mechanism by which the membrane spanning ion channels contribute to the resting membrane potential?

  • By generating an electrochemical gradient
  • By actively pumping ions across the membrane
  • By maintaining unequal concentrations of sodium and potassium ions
  • By allowing the passage of cations through the channels (correct)

    • What would be the membrane potential if the membrane is only permeable to sodium?

  • 0mV
  • +55mV (correct)
  • -55mV
  • -70mV

    • What is the net effect of the sodium/potassium pump on the membrane potential?

  • It makes the inside of the cell more positive
  • It makes the inside of the cell more negative (correct)
  • It has no direct effect on the membrane potential
  • It only affects the concentration of sodium ions

    • What is the term for the state of the cell when the inside is negatively charged with respect to the outside?

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

    What determines the membrane permeability?

    <p>The presence of membrane spanning ion channels</p> Signup and view all the answers

    What would be the effect of a hyperpolarization on the membrane potential?

    <p>The inside of the cell becomes more negative</p> Signup and view all the answers

    What is the role of the sodium/potassium pump in establishing and maintaining the unequal distribution of sodium and potassium ions?

    <p>It maintains the unequal concentrations of sodium and potassium ions</p> Signup and view all the answers

    What is the equation that describes the membrane potential when the membrane is permeable to multiple ions?

    <p>Goldman-Hodgkin-Katz equation</p> Signup and view all the answers

    Why does the membrane potential not equal -65mV if the membrane is equally permeable to both sodium and potassium?

    <p>Because there is unequal permeability to sodium and potassium</p> Signup and view all the answers

    What is the term for the movement of ions down their electrochemical gradient?

    <p>Passive transport</p> Signup and view all the answers

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