Master the Resting Membrane Potential
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Questions and Answers

Which of the following factors contributes to maintaining the resting membrane potential (RMP)?

  • The semi-permeability of the membrane
  • The activity of the Na+ K+ ATPase pump
  • The concentration of intracellular impermeable anions
  • All of the above (correct)
  • What is the typical resting membrane potential (RMP) of nerve cells?

  • -70 mV (correct)
  • -50 mV
  • -90 mV
  • -30 mV
  • Which process involves reducing the negativity of the cell?

  • Depolarization (correct)
  • Polarization
  • Hyperpolarization
  • Repolarization
  • Which stage of an action potential involves a rapid rise in potential in a positive direction?

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

    What is the characteristic of action potentials that makes them all-or-none responses?

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

    What is the membrane potential at which an action potential is inevitable?

    <p>Threshold level</p> Signup and view all the answers

    During which period of the refractory period is a stronger stimulus required to generate another action potential?

    <p>Relative refractory period</p> Signup and view all the answers

    What is the characteristic of local potentials in excitable cells?

    <p>They are graded responses</p> Signup and view all the answers

    What type of summation occurs when multiple stimuli fire simultaneously and contribute to the generation of a local potential?

    <p>Spatial summation</p> Signup and view all the answers

    Which type of potential depolarizes the membrane?

    <p>Excitatory post-synaptic potentials (EPSPs)</p> Signup and view all the answers

    What is the main difference between local potentials and action potentials?

    <p>Local potentials are not propagated, while action potentials travel along the membrane.</p> Signup and view all the answers

    Which factors can alter the changes associated with action potentials?

    <p>Changes in sodium (Na+), potassium (K+), and calcium (Ca2+) concentrations</p> Signup and view all the answers

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