Resting Membrane Potential Quiz
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Questions and Answers

What is the typical value for resting membrane potential in nerve fibers?

  • -90 mV
  • -70 mV (correct)
  • -30 mV
  • -50 mV
  • What is the main cause of unequal distribution of ions across the cell membrane during rest?

  • Equal distribution of ions across the cell membrane
  • Intracellular non-movable positively charged proteins
  • Selective membrane permeability to Na+ ions
  • Selective membrane permeability to K+ ions (correct)
  • What is the role of the Na+/K+-ATPase pump in maintaining resting membrane potential?

  • It pumps 2 Na+ ions into the cell
  • It pumps 3 K+ ions out of the cell
  • It pumps 3 Na+ ions into the cell (correct)
  • It pumps 2 K+ ions out of the cell
  • What type of ion channels are stimulated by changes in voltage?

    <p>Voltage-gated channels</p> Signup and view all the answers

    What is the typical value for resting membrane potential in skeletal and cardiac muscle fibers?

    <p>-90 mV</p> Signup and view all the answers

    Explain the role of the Na+/K+-ATPase pump in maintaining the resting membrane potential.

    <p>The Na+/K+-ATPase pump pumps 3 Na+ out of the cell and 2 K+ ions into the cell, contributing to the unequal distribution of ions across the cell membrane and helping to maintain the resting membrane potential.</p> Signup and view all the answers

    How does the unequal distribution of ions across the cell membrane contribute to the resting membrane potential?

    <p>The unequal distribution of ions, with the membrane being more permeable to potassium ions (K+) than sodium ions (Na+), leads to more positive ions being pumped outside than inside, resulting in negativity inside and positivity outside the cell.</p> Signup and view all the answers

    What is the significance of the intracellular non-movable negatively charged proteins in maintaining the resting membrane potential?

    <p>The non-movable negatively charged proteins on the inner surface of the cell membrane contribute to the negativity inside the cell, as they cannot move due to their large size.</p> Signup and view all the answers

    Describe the role of leak channels in the behavior of nerve cell membranes.

    <p>Leak channels play a role in maintaining the resting membrane potential by allowing a slow leakage of ions, helping to stabilize the membrane potential.</p> Signup and view all the answers

    How do voltage-gated channels contribute to the electrical events in nerves?

    <p>Voltage-gated channels are stimulated by changes in voltage and play a key role in generating and propagating action potentials in nerve cells.</p> Signup and view all the answers

    What is the typical value for resting membrane potential in nerve fibers?

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

    What is the typical value for resting membrane potential in skeletal and cardiac muscle fibers?

    <p>-90 mV</p> Signup and view all the answers

    What is the main cause of the unequal distribution of ions across the cell membrane during rest?

    <p>Unequal distribution of ions across cell membrane in extracellular fluid and cytoplasm due to selective membrane permeability, Na+/K+-ATPase pump, and intracellular non-movable negatively charged proteins.</p> Signup and view all the answers

    What is the role of the Na+/K+-ATPase pump in maintaining the resting membrane potential?

    <p>The Na+/K+-ATPase pump pumps 3 Na+ out of the cell and 2 K+ ions into the cell, contributing to the negativity inside and positivity outside the cell, thus maintaining the resting membrane potential.</p> Signup and view all the answers

    How do leak channels and gated channels contribute to the behavior of nerve cell membranes?

    <p>Leak channels allow the passive movement of ions, while gated channels, including voltage-gated and ligand-gated channels, are stimulated by changes in voltage or attachment of a substance, respectively, contributing to the electrical events in nerves.</p> Signup and view all the answers

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