Neuronal Sodium Potassium Pump Mechanism
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Questions and Answers

What is the state of the inactivation gates of the sodium channel during the resting state?

  • OPEN (correct)
  • PARTIALLY OPEN
  • NOT DEFINED
  • CLOSED
  • During which stage of the action potential is the activation gate of the sodium channel closed?

  • Peak
  • Resting state (correct)
  • Repolarization
  • Depolarization
  • What is the direction of the action potential once it is triggered?

  • It stays at the point of origin
  • It travels in all directions away from the stimulus (correct)
  • It travels only towards the axon terminal
  • It travels only towards the dendrites
  • What is the type of conduction that occurs in myelinated fibers?

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

    What is necessary for the action potential to spread from active to inactive areas?

    <p>Depolarization of the inactive area to threshold</p> Signup and view all the answers

    What is the term for the time period between the application of a stimulus and the start of the response?

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

    What is the characteristic of the conduction of action potentials in unmyelinated nerve fibers?

    <p>The action potential spreads along every portion of the membrane</p> Signup and view all the answers

    What is the effect of the action potential on the last part of the axon, regardless of the length of the axon?

    <p>It remains the same as the original</p> Signup and view all the answers

    What is the nature of the action potential as it travels down the nerve fiber?

    <p>It does not travel down the nerve fiber</p> Signup and view all the answers

    What is the status of voltage-gated K+ channels during the resting membrane potential?

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

    What happens to the original active area after the action potential has spread to the adjacent area?

    <p>It returns to resting potential</p> Signup and view all the answers

    What is the process by which excess potassium ions leave the cell during an action potential?

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

    What is the primary ion responsible for depolarization during an action potential?

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

    What is the critical level of membrane potential that triggers an action potential?

    <p>-65 mV</p> Signup and view all the answers

    What happens to the voltage-gated Na channels in the inactive area when it reaches threshold?

    <p>They are all thrown open</p> Signup and view all the answers

    What can be compared to the action potential propagating along the nerve fiber?

    <p>A wave at a stadium</p> Signup and view all the answers

    What is the period during which a neuron is unable to generate another action potential due to the inactivation of voltage-gated Na+ channels?

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

    What is the primary mechanism of neurotransmission during an action potential?

    <p>Neurotransmitter release</p> Signup and view all the answers

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