The Nernst Potential
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Questions and Answers

Which term is used to describe the diffusion potential across a membrane that opposes the net diffusion of a specific ion?

  • Diffusion potential
  • Net potential
  • Membrane potential
  • Nernst potential (correct)
  • What determines the magnitude of the Nernst potential for a specific ion?

  • Temperature of the environment
  • Ratio of ion concentrations on both sides of the membrane (correct)
  • Size of the membrane
  • Concentration of other ions
  • What happens to the Nernst potential if the ratio of ion concentrations on both sides of the membrane increases?

  • It increases (correct)
  • It remains the same
  • It becomes negative
  • It decreases
  • What equation can be used to calculate the Nernst potential for any univalent ion at the normal body temperature of 98.6°F (37°C)?

    <p>Nernst equation</p> Signup and view all the answers

    What is the net diffusion of an ion when the diffusion potential across the membrane is equal to the Nernst potential for that ion?

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

    the ______ is determined by the ratio of the concentrations of that specific ion on the two sides of the membrane

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

    The greater this ______, the greater the tendency for the ion to diffuse in one direction and therefore the greater the Nernst potential required to prevent additional net diffusion.

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

    The following equation, called the ______, can be used to calculate the Nernst potential for any univalent ion at the normal body temperature of 98.6°F (37°C).

    <p>Nernst equation</p> Signup and view all the answers

    The ______ potential across a membrane that exactly opposes the net diffusion of a particular ion through the membrane is called the Nernst potential for that ion

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

    The diffusion potential across a membrane that exactly opposes the net diffusion of a particular ion through the membrane is called the Nernst potential for ______ ion

    <p>any univalent</p> Signup and view all the answers

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