Molecular Biophysics 2024: Action Potential Propagation
18 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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

    More Like This

    Moleküler Biyofizik Quizi
    10 questions
    Introduction to Biophysics
    16 questions
    Introduction to Biophysics
    10 questions

    Introduction to Biophysics

    InestimableLesNabis avatar
    InestimableLesNabis
    Use Quizgecko on...
    Browser
    Browser