Action Potential Stages
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Questions and Answers

What is the resting potential of a neuron?

  • -70 mV (correct)
  • -90 mV
  • -110 mV
  • -50 mV

    • What happens to the membrane potential when the Na+ channels open?

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

    • What is the purpose of the Na+/K+ pump?

  • To prevent the neuron from receiving another stimulus
  • To close voltage-gated channels
  • To open voltage-gated channels
  • To bring the membrane back to its resting state (correct)

    • What happens during the repolarization phase?

    <p>The membrane potential becomes more negative</p> Signup and view all the answers

    What is the purpose of the refractory period?

    <p>To prevent the neuron from receiving another stimulus during this time</p> Signup and view all the answers

    What is the All-Or-Nothing principle in nerve conduction?

    <p>The action potential either occurs fully or not at all</p> Signup and view all the answers

    What is the primary function of action potentials in nerve cells?

    <p>To transmit nerve signals or impulses</p> Signup and view all the answers

    During which phase of the action potential do Na+ channels open and Na+ floods into the neuron?

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

    What is the term for the period during which no impulses can pass along a part of the membrane?

    <p>Refractory period</p> Signup and view all the answers

    What is the purpose of active pumping of Na+ out and K+ in during the hyperpolarization phase?

    <p>To maintain the resting potential of the neuron</p> Signup and view all the answers

    What is the change in membrane polarity that occurs during an action potential?

    <p>A sudden reversal of membrane polarity</p> Signup and view all the answers

    What is the membrane potential at the threshold?

    <p>-55 mV</p> Signup and view all the answers

    What is the term for the process by which action potentials rapidly jump from node to node in myelinated nerve fibers?

    <p>Saltatory conduction</p> Signup and view all the answers

    What factor other than myelination influences the speed of action potential transmission?

    <p>Diameter of the axon</p> Signup and view all the answers

    What type of potential is generated by a weak subthreshold stimulus?

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

    What is the term for a graded potential that makes the membrane more polarized (inside more negative)?

    <p>Hyperpolarizing graded potential</p> Signup and view all the answers

    What is the term for the movement of ions across the neuron membrane that generates an action potential?

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

    What is the term for the period during which a neuron is unable to generate another action potential?

    <p>Refractory period</p> Signup and view all the answers

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