Action Potential
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Questions and Answers

What is the main purpose of the action potential in a neuron?

  • Producing contraction in muscle cells
  • Balancing ion leakage and ion pumping
  • Producing the nerve impulse (correct)
  • Creating a negative electric polarization
  • What is the typical resting potential of a polarized neuron or muscle cell?

  • -50 mV
  • +75 mV
  • -100 mV
  • -75 mV (correct)
  • What describes the steady state of a cell's membrane potential?

  • Action potential generation
  • Depolarization
  • Ion leakage imbalance
  • Resting membrane potential (correct)
  • What is the primary factor that drives sodium ions into the cell during depolarization?

    <p>Concentration gradient of sodium ions</p> Signup and view all the answers

    What initiates the generation of an action potential in a cell?

    <p>Channel opening for Na+ in the membrane</p> Signup and view all the answers

    How does depolarization affect the membrane potential?

    <p>Moves it toward zero</p> Signup and view all the answers

    What is the membrane potential when sodium channels open completely?

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

    What happens to the membrane potential when other voltage-gated channels specific for potassium ion start opening?

    <p>Depolarizes to +35 mV</p> Signup and view all the answers

    What occurs when potassium ions leave the cell during repolarization?

    <p>Membrane potential moves back toward its resting voltage</p> Signup and view all the answers

    What happens when potassium ions reach equilibrium during hyperpolarization?

    <p>Membrane voltage goes below -70 mV</p> Signup and view all the answers

    What is the significance of the short overshoot in membrane potential during hyperpolarization?

    <p>K+ channels remain open longer than expected</p> Signup and view all the answers

    Which ion is responsible for repolarization of the membrane potential?

    <p>Potassium ion</p> Signup and view all the answers

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