Neuron Action Potential and Ion Channels
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Questions and Answers

What is the threshold potential at which an action potential starts to occur?

  • -20 mV
  • -50 mV
  • +20 mV
  • +30/40 mV (correct)

    • What happens to the membrane potential during the falling phase of an action potential?

  • It fluctuates randomly
  • It becomes more negative (correct)
  • It remains the same
  • It becomes more positive

    • What is the role of the Na+/K+ transporters in the recovery phase of an action potential?

  • To maintain the action potential
  • To pump K+ ions into the cell
  • To pump Na+ ions out of the cell
  • To restore the resting potential (correct)

    • What happens to the voltage-gated Na+ channels during the peak of an action potential?

    <p>They open and allow Na+ ions to rush in</p> Signup and view all the answers

    What is the state of the membrane during the refractory period?

    <p>It is unable to fire</p> Signup and view all the answers

    What is the resting membrane potential of a neuron?

    <p>-70 mV</p> Signup and view all the answers

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