Neuron Action Potential and Sodium-Potassium Pump
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Questions and Answers

What is the term used for a decrease in the amount of negative charge within the cell?

  • Hyperpolarization
  • Depolarization (correct)
  • Saltatory conduction
  • Local neurons
  • Which law states that the amplitude and velocity of an action potential are independent of the intensity of the stimulus that initiated it?

  • The All-or-None Law (correct)
  • Saltatory conduction
  • Hyperpolarization
  • Graded potential
  • What happens at the peak of an action potential?

  • The potassium channels open
  • The sodium channels open
  • The potassium channels close
  • The sodium channels close (correct)
  • Which ions are mostly outside the neuron at the start, according to the text?

    <p>Sodium ions (B)</p> Signup and view all the answers

    What is responsible for allowing a particular type of ion to cross the membrane in a neuron?

    <p>Voltage-gated channels (D)</p> Signup and view all the answers

    Which term refers to an exaggeration of the usual negative charge within a cell to a more negative level than usual?

    <p>Hyperpolarization (B)</p> Signup and view all the answers

    What is the term used to describe the difference in electrical charge between the inside and outside of a cell when it is at rest?

    <p>Polarization (C)</p> Signup and view all the answers

    What is the main reason for the slightly negative electrical potential inside the membrane of a cell?

    <p>Negatively charged proteins inside the cell (A)</p> Signup and view all the answers

    What protein complex is responsible for transporting three sodium ions out of the cell while drawing two potassium ions into it?

    <p>Sodium-Potassium Pump (C)</p> Signup and view all the answers

    Which term describes a disturbance in the resting potential that leads to the development of messages in a neuron?

    <p>Graded Potential (B)</p> Signup and view all the answers

    What characteristic of the cell membrane prevents it from depolarizing by allowing some chemicals to pass through more freely than others?

    <p>Selective Permeability (C)</p> Signup and view all the answers

    What is responsible for preventing sodium ions from leaking back into the neuron after being pumped out?

    <p>Selective permeability of the membrane (D)</p> Signup and view all the answers

    Which process requires a significant amount of energy from the body?

    <p>Maintaining the resting potential (D)</p> Signup and view all the answers

    What is responsible for preparing the neuron to respond rapidly?

    <p>Resting potential (D)</p> Signup and view all the answers

    Which force tends to pull sodium into the cell based on opposite electrical charges attraction?

    <p>Electrical gradient (D)</p> Signup and view all the answers

    What term describes the change in charge to a more negative level inside an axon during hyperpolarization?

    <p>Hyperpolarization (C)</p> Signup and view all the answers

    What produces a small response that quickly decays if it does not reach the threshold for a full response?

    <p>Subthreshold stimulation (C)</p> Signup and view all the answers

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