Permeability and Conductance Quiz
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Permeability and Conductance Quiz

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Questions and Answers

What is the driving force for diffusion down a concentration gradient?

  • Electrical force
  • Chemical force (correct)
  • Pressure force
  • Magnetic force
  • According to Fick's Laws, what factor contributes to a slower rate of diffusion?

  • Larger molecular weight of the solute (correct)
  • Larger concentration gradient
  • Higher permeability of the membrane
  • Larger surface area of the membrane
  • In the context of osmosis, what diffuses down its concentration gradient?

  • Solute
  • Membrane
  • Water (correct)
  • Ions
  • In Case 1 described in the text, where does the net movement of water occur?

    <p>From side 1 to side 2</p> Signup and view all the answers

    What is the membrane permeable to in Case 2?

    <p>Water only</p> Signup and view all the answers

    Which factor results in a faster rate of diffusion according to Fick's Laws?

    <p>Smaller distance (thickness) of the membrane</p> Signup and view all the answers

    What is the role of leak channels in the cell membrane?

    <p>Enable ions to diffuse down their concentration gradient</p> Signup and view all the answers

    If the extracellular concentration of K+ ions is artificially increased, what would happen to the equilibrium potential for K+ (EK)?

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

    What effect does the Na+/K+ ATPase have on the cell membrane?

    <p>Creates and maintains concentration gradients of Na+ and K+ ions</p> Signup and view all the answers

    How does the Nernst Equation relate to ion equilibrium potentials?

    <p>Determines the equilibrium potential for a specific ion based on its concentration gradient</p> Signup and view all the answers

    What is the function of the Na+/K+ ATPase in maintaining cell homeostasis?

    <p>Establishes and upholds ion concentration gradients essential for cellular function</p> Signup and view all the answers

    How would an increase in extracellular K+ ions affect the equilibrium potential for Na+ (ENa)?

    <p>Shift towards a more positive value</p> Signup and view all the answers

    What happens to the net movement of water in the initial state described in the text?

    <p>Moves from side 1 to side 2</p> Signup and view all the answers

    What is the final state in terms of water and solute concentrations as mentioned in the text?

    <p>Water concentrations equal, solute concentrations equal</p> Signup and view all the answers

    What stops the net diffusion of water in the scenario with pure water on side 1?

    <p>Hydrostatic pressure</p> Signup and view all the answers

    Why do cells care about osmotic pressure?

    <p>To maintain water balance</p> Signup and view all the answers

    What is the term for the voltage difference across the plasma membrane when the cell is at rest?

    <p>Membrane potential</p> Signup and view all the answers

    What type of movement occurs due to electrostatic attraction or repulsion in cells?

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

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