Exercise 1: Cell Transport Mechanisms and Permeability Worksheet

756 WordsFeb 17, 20114 Pages
Simple Diffusion Activity 1: Simulating Simple diffusion 1. What is the molecular weight of Na+? 22.99 2. What is the molecular weight of Cl-? 35.45 3. Which MWCO dialysis membranes allowed both of these ions through? 50, 100, and 200 4. Which materials diffused from the left beaker to the right beaker? NaCl, Urea, and Glucose at MWCO 200 5. Which did not? Why? Albumin, too large to diffuse Activity 2: Simulating Dialysis 1. What happens to the urea concentration in the left beaker (the patient)? It mixes with the water to balance out the structure. 2. Why does this occur? Molecules are moving around to make space. Facilitated Diffusion Activity 3: Facilitated Diffusion 1. At a given glucose concentration, how…show more content…
7. Would pressure be generated if solute concentrations were equal on both sides of the membrane? No because it would be equal on both sides. 8. Why or why not? It would be equal on both sides 9. Would pressure be generated if you had 9 mM glucose on one side of a 200 MWCO membrane and 9 mM NaCl on the other side? If so, which solution was generating the pressure? It would have no effect because it would be able to diffuse. 10. Would pressure be generated if you had 9 mM albumin on one side of a 200 MWCO membrane and 9 mM NaCl on the other side? If so, which solution was generating the pressure? pressure would be present due to different concentrations which are not equal. Filtration Activity 5: Filtration 1. Does the membrane MWCO affect filtration rate? Yes smaller the MWCO smaller the pore size and this affected the filtration rate 2. Does the amount of pressure applied affect the filtration rate? yes 3. Did all solutes pass through all the membranes? no 4. If not, which one(s) did not? Urea was not present 5. Why? Diffuse is hard for urea to conduct 6. How can the body selectively increase the filtration rate of a given organ or organ system? Blood supply can be increased or decreased Active Transport Activity 6: Active Transport 1. At the end of this experimental run, did the Na+/Cl- move from the left vessel to the right vessel? no 2. Why? It would need to move from a lower

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