Equilibrium and Resting Potentials Quiz
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Questions and Answers

Which force is responsible for the equilibrium membrane potential of a nerve cell?

  • Electrical force (correct)
  • Gravity
  • Friction
  • Diffusion
  • Why does the resting potential of a nerve exist?

  • The membrane is impermeable to small ions
  • The membrane is permeable to large negative proteins
  • The membrane is impermeable to large negative proteins (correct)
  • The membrane is permeable to small ions
  • What is the Nernst equation used for?

  • Calculating the concentration of ions outside a cell
  • Calculating the equilibrium membrane potential of a nerve cell (correct)
  • Calculating the rate of diffusion of ions
  • Calculating the concentration of ions inside a cell
  • What does RT/F equal at room temperature (25°C, 298K)?

    <p>25 mV</p> Signup and view all the answers

    Given the outside and inside concentrations of K+ ion as 20,400 g/l, what is the equilibrium membrane potential of K+?

    <p>20 mV</p> Signup and view all the answers

    Which type of stimuli can initiate an action potential in a neuron?

    <p>Both physical and chemical stimuli</p> Signup and view all the answers

    What is the approximate change in membrane potential required to initiate an action potential?

    <p>20 mV</p> Signup and view all the answers

    Which ion passes through the membrane, causing depolarization during an action potential?

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

    What happens to the membrane potential during depolarization?

    <p>It becomes more positive</p> Signup and view all the answers

    How long does the action potential typically last in most neurons and muscle cells?

    <p>A few milliseconds</p> Signup and view all the answers

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