Cellular Solute Movement and Equilibrium
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Questions and Answers

What is the approximate resting membrane potential of a neuron?

  • -80 mV
  • -50 mV
  • -70 mV (correct)
  • -55 mV

    • What happens if a neuron fails to reach the threshold potential?

  • Membrane hyperpolarization occurs
  • Nothing happens (correct)
  • Depolarization occurs
  • Repolarization occurs

    • Which ion has the greatest permeability in maintaining the resting membrane potential?

  • Calcium (Ca2+)
  • Potassium (K+) (correct)
  • Chloride (Cl-)
  • Sodium (Na+)

    • What effect does tetrodotoxin (puffer fish consumption) have on nerve tissue?

    <p>It prevents depolarization and action potential formation</p> Signup and view all the answers

    At the peak of the action potential, which ion's permeability is approximately 12 times larger than potassium?

    <p>Sodium (Na+)</p> Signup and view all the answers

    What determines the movement of charged particles across the membrane?

    <p>Both their concentration gradients and electrical potential</p> Signup and view all the answers

    Which ion dominates the extracellular fluid?

    <p>Sodium (Na+)</p> Signup and view all the answers

    What is the major anion of the intracellular fluid?

    <p>Phosphate ions</p> Signup and view all the answers

    What is the approximate value of the resting membrane potential?

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

    Which ion has the greatest permeability at the resting state of the plasma membrane?

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

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