Action Potentials and Nerve Membrane Function Quiz
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Questions and Answers

What factors determine the time and length constants of a nerve membrane?

  • The membrane resistance and capacitance (correct)
  • The number of action potentials generated
  • The type of neurotransmitter released
  • The size of the nerve fiber

    • How does an action potential differ from the subthreshold responses of a membrane?

  • Action potential occurs only in sensory neurons, while subthreshold responses occur in motor neurons.
  • Action potential is always inhibitory, while subthreshold responses can be excitatory or inhibitory.
  • Action potential results from chemical signaling, while subthreshold responses are purely electrical.
  • Action potential involves a rapid depolarization and repolarization of the membrane, while subthreshold responses are slower and do not reach the threshold for an action potential. (correct)

    • What is the sequence of conductances that underlies the action potential?

  • Na+ influx followed by K+ efflux (correct)
  • Na+ influx followed by Cl- efflux
  • K+ influx followed by Na+ efflux
  • Cl- influx followed by Na+ efflux

    • How are the responses of Na+ and K+ channels to membrane depolarization similar?

    <p>Both channels open in response to membrane depolarization</p> Signup and view all the answers

    How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?

    <p>The gating properties determine the duration of the absolute and relative refractory periods</p> Signup and view all the answers

    What is the nerve membrane's response to small-amplitude stimuli similar to?

    <p>A passive electric circuit comprising batteries, resistors, and capacitors</p> Signup and view all the answers

    What causes the responses of Na+ and K+ channels to differ?

    <p>The presence of the Na+ channel inactivation gate</p> Signup and view all the answers

    What shapes the electric responses of the nerve membrane?

    <p>Time and length constants</p> Signup and view all the answers

    What underlies the action potential?

    <p>Sequence of conductances</p> Signup and view all the answers

    How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?

    <p>They determine the duration of the refractory periods</p> Signup and view all the answers

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