Simulating Facilitated Diffusion
-Did any of the substances travel against their concentration gradient? Explain why or why not.
-Using your results from Chart 2, what was the fastest rate of facilitated diffusion recorded? Describe
the conditions that were used to achieve this rate.
-Name two ways to increase the rate of glucose transport.
-Did NaCl affect glucose transport?
-Did NaCl require a transport protein for diffusion? Why or why not?
Simulating Osmotic Pressure.
-For NaCl, which MWCO membrane(s) provided for the net movement of water without movement of
NaCl?
-Explain how you determined this.
-Explain how you determined this.
-Is osmotic pressure generated if solutes diffuse freely
-Explain how the solute concentration affects osmotic pressure.
Simulating Filtration.
-Using your results in Chart 4, which MWCO membrane had the greatest filtration rate?
-Explain the relationship between pore size and filtration rate.
-Which solute did not appear in the filtrate using any of the membranes?
-What is your prediction of the molecular weight of glucose compared to the other solutes in the
solution?
-What happened when you increased the driving pressure?
-Explain why fluid flows from the capillaries of the kidneys into the kidney tubules.
-How do you think a decrease in blood pressure would affect filtration in the kidneys?
Simulating Active Transport.
-With 1 mM ATP added to the cell interior (left beaker) and the extracellular space (right beaker), was
all of the Na+ moved into the extracellular space? Why or why not?
-Describe the effect of decreasing the number of sodium-potassium pumps.
-Describe how you were able to show that the movement of sodium was due to active transport.
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