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1R E V I E W S H E E T

Simple Diffusion1. The following refer to Activity 1: Simulating Dialysis (Simple Diffusion).

Which solute(s) were able to pass through the 20 MWCO membrane?

According to your results, which solute had the highest molecular weight? ______________________________________

Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? __________________________

Using the data from Chart 1, explain the relationship between the rate of diffusion and the size of the solute.

Facilitated Diffusion2. The following refer to Activity 2: 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? ____________________________________________

Cell Transport Mechanismsand Permeability

E X E R C I S E

NAME ____________________________________

LAB TIME/DATE ________________________

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Osmotic Pressure3. The following refer to Activity 3: 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. (Hint: Correlate your results to the data in Chart 3.) ______________________________

For glucose, which MWCO membrane(s) provided for the net movement of glucose without net movement of water?

Explain how you determined this. _______________________________________________________________________

Is osmotic pressure generated if solutes diffuse freely? _______________________________________________________

Explain how the solute concentration affects osmotic pressure. ________________________________________________

Filtration4. The following refer to Activity 4: 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? ______________________________

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5. The following refer to Activity 5: 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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