Diffusion and Glucose

1477 Words Aug 16th, 2013 6 Pages
Physioex 9.0
Review Sheet
Exercise 1
Cell Transport Mechanisms and Permeability
Name
Lab Time/Date ___
Activity 1 Simulating Dialysis (Simple Diffusion)
1. Describe two variables that affect the rate of diffusion. Size of material and concentration
2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? The molecules were too large to pass through. This is what I predicted on my Hypothesis.
3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? The glucose diffused through the 200 MCWO
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It increased the filtration rate because the blood pressure increased, but the concentration of solutes did not because the pore size did not increase.
___
Activity 5 Simulating Active Transport
1. Describe the significance of using 9 mM sodium chloride inside the cell and 6 mM potassium chloride outside the cell, instead of other concentration ratios. The reason for the use of 9mM of sodium chloride is because 3 ions are ejected for every 2 K that are added. K hangs outside the cell unless actively transport inside the cell.
2. Explain why there was no sodium transport even though ATP was present. How well did the results compare with your prediction? There were no sodium ions because they were ejected by the cells by active transport.
3. Explain why the addition of glucose carriers had no effect on sodium or potassium transport. How well did the results compare with your prediction? The introduction of glucose had no effect on the sodium and potassium transport due to solute pumps.
4. Do you think glucose is being actively transported or transported by facilitated diffusion in this experiment? Explain your answer. The glucose is transported by facilitated diffusion in the experiment that is how glucose is transported. The glucose could not be actively transported because they are lipid insoluble and too large to pass through the membrane pores.

Lab Report 1

Activity 1

The purpose of this lab is to gain a better

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