Permeability and Conductance Quiz

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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?

From side 1 to side 2 Signup and view all the answers

What is the membrane permeable to in Case 2?

Water only Signup and view all the answers

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

Smaller distance (thickness) of the membrane Signup and view all the answers

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

Enable ions to diffuse down their concentration gradient 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)?

Increase Signup and view all the answers

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

Creates and maintains concentration gradients of Na+ and K+ ions Signup and view all the answers

How does the Nernst Equation relate to ion equilibrium potentials?

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

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

Establishes and upholds ion concentration gradients essential for cellular function Signup and view all the answers

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

Shift towards a more positive value Signup and view all the answers

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

Moves from side 1 to side 2 Signup and view all the answers

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

Water concentrations equal, solute concentrations equal Signup and view all the answers

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

Hydrostatic pressure Signup and view all the answers

Why do cells care about osmotic pressure?

To maintain water balance Signup and view all the answers

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

Membrane potential Signup and view all the answers

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

Electrophoresis Signup and view all the answers