Molecular Biophysics 2024: Action Potential Propagation
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Questions and Answers

What unusual activity constitutes the propagation of an electrical signal?

  • Graded potentials
  • Depolarization (correct)
  • Repolarization
  • Hyperpolarization

    • During depolarization, what type of ions flow into the cell?

  • Cl- ions
  • K+ ions
  • Ca2+ ions
  • Na+ ions (correct)

    • What event characterizes repolarization during an action potential?

  • An influx of Na+ ions
  • A decrease in voltage due to Cl- ions efflux
  • Hyperpolarization
  • A decrease in voltage due to K+ ions efflux (correct)

    • What is the membrane resting potential typically around?

    <p>-70 mV</p> Signup and view all the answers

    Which process is responsible for hyperpolarization?

    <p>Efflux of K+ ions</p> Signup and view all the answers

    What causes depolarization during an action potential?

    <p>Influx of Na+ ions</p> Signup and view all the answers

    What are graded potentials?

    <p>Minor perturbations in the membrane potential due to neurotransmitter binding</p> Signup and view all the answers

    How are action potentials different from graded potentials?

    <p>They initially have large depolarizations above the resting value</p> Signup and view all the answers

    What is the threshold for an action potential?

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

    What is the resting membrane potential?

    <p>-70 mV</p> Signup and view all the answers

    During an action potential, what occurs after depolarization?

    <p>Repolarization happens</p> Signup and view all the answers

    What leads to graded potentials adding up and propagating short distances along the membrane?

    <p>Binding of neurotransmitters</p> Signup and view all the answers

    What is the average Resting Membrane Potential (RMP) of a typical neuron?

    <p>-70 mV</p> Signup and view all the answers

    Which ion has a higher concentration inside the cell compared to outside?

    <p>K+</p> Signup and view all the answers

    What is the voltage difference when the extracellular potential is defined as 0 V?

    <p>-70 mV</p> Signup and view all the answers

    What happens during depolarization of a cell membrane?

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

    What is the main factor contributing to the Resting Membrane Potential (RMP)?

    <p>Unequal distribution of ions</p> Signup and view all the answers

    Which cell type exhibits a Resting Membrane Potential closest to -95 mV?

    <p>Skeletal muscle fibers</p> Signup and view all the answers

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