physioEx 9.0 Exercise 1 Act 4

Name: Ashlei Sickles Exercise 1: Cell Transport Mechanisms and Permeability: Activity 4: Simulating Filtration Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Filtration is a process that You correctly answered: c. is passive. 2. Filtration is dependent upon a You correctly answered: b. hydrostatic pressure gradient. 3. The filtrate You correctly answered: d. All of these answers are correct. 4. An important place that filtration takes place in the body is in You correctly answered: d. the kidneys.

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Experiment Results Predict Question: Predict Question 1: What effect will increasing the pore size of the filter have on the filtration rate? Your answer : c. The filtration rate will increase. Predict Question 2: What will happen if you increase the pressure above the beaker (the driving pressure)? Your answer : a. The filtration rate will increase. Stop & Think Questions: The reason none of the solutes were present in the filtrate was that You correctly answered: b. the solutes were all too large to pass through. What does an increase in the driving pressure correspond to in the body? You correctly answered: d. an increase in blood pressure Experiment Data: Run Number 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4

Solute Na+ ClUrea Glucose Powdered Charcoal Na+ ClUrea Glucose Powdered Charcoal Na+ ClUrea Glucose Powdered Charcoal Na+ ClUrea Glucose Powdered Charcoal

MWCO 20 20 20 20 50 50 50 50 200 200 200 200 200 200 200 200

Pressure 50 50 50 50 50 50 50 50 50 50 50 50 100 100 100 100

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Filter Rate 1 1 1 1 2.5 2.5 2.5 2.5 10 10 10 10 20 20 20 20

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Residue present present present present present present present present present present present present present present present present

Start Conc. 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00

Filter Conc. 0.00 0.00 0.00 0.00 4.81 0.00 0.00 0.00 4.81 4.74 4.39 0.00 4.81 4.74 4.39 0.00

Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. After filtration, substances that pass through the filter are called the filtrate, which includes You correctly answered: d. all of the above. 2. The top beaker in the simulation corresponds to You correctly answered: a. the blood capillary. 3. Why was there not 100% recovery of the Na+ Cl- solute with any of the membranes? You correctly answered: c. Some of the solute remained on the membrane filter. 4. An increase in blood pressure would probably initially __________ filtration in the kidneys. You correctly answered: b. increase the rate of

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Review Sheet Results 1. Explain in your own words why increasing the pore size increased the filtration rate. Use an analogy to support your statement. How well did the results compare with your prediction? Your answer: Increasing the pore size would increase the rate of filtraion because more would be able to pass through. It would be like a coffee filter. My prediction was correct. 2. Which solute did not appear in the filtrate using any of the membranes? Explain why. Your answer: The powedered charcoal did not filtrate through any of the membranes. I think this is because the charcoal contains large molecules and therefore it is not able to pass through the pores of the membranes. 3. Why did increasing the pressure increase the filtration rate but not the concentration of solutes? How well did the results compare with your prediction? Your answer: Increasing the pressure increases the filtration rate since the molecules are able to pass through faster. However, it does not increase the concentration of solutes that passes through the membrane. My prediction was supported by the results.

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