Podcast
Questions and Answers
What is the driving force for diffusion down a concentration gradient?
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?
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?
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?
In Case 1 described in the text, where does the net movement of water occur?
What is the membrane permeable to in Case 2?
What is the membrane permeable to in Case 2?
Which factor results in a faster rate of diffusion according to Fick's Laws?
Which factor results in a faster rate of diffusion according to Fick's Laws?
What is the role of leak channels in the cell membrane?
What is the role of leak channels in the cell membrane?
If the extracellular concentration of K+ ions is artificially increased, what would happen to the equilibrium potential for K+ (EK)?
If the extracellular concentration of K+ ions is artificially increased, what would happen to the equilibrium potential for K+ (EK)?
What effect does the Na+/K+ ATPase have on the cell membrane?
What effect does the Na+/K+ ATPase have on the cell membrane?
How does the Nernst Equation relate to ion equilibrium potentials?
How does the Nernst Equation relate to ion equilibrium potentials?
What is the function of the Na+/K+ ATPase in maintaining cell homeostasis?
What is the function of the Na+/K+ ATPase in maintaining cell homeostasis?
How would an increase in extracellular K+ ions affect the equilibrium potential for Na+ (ENa)?
How would an increase in extracellular K+ ions affect the equilibrium potential for Na+ (ENa)?
What happens to the net movement of water in the initial state described in the text?
What happens to the net movement of water in the initial state described in the text?
What is the final state in terms of water and solute concentrations as mentioned in the text?
What is the final state in terms of water and solute concentrations as mentioned in the text?
What stops the net diffusion of water in the scenario with pure water on side 1?
What stops the net diffusion of water in the scenario with pure water on side 1?
Why do cells care about osmotic pressure?
Why do cells care about osmotic pressure?
What is the term for the voltage difference across the plasma membrane when the cell is at rest?
What is the term for the voltage difference across the plasma membrane when the cell is at rest?
What type of movement occurs due to electrostatic attraction or repulsion in cells?
What type of movement occurs due to electrostatic attraction or repulsion in cells?
