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Lab 15AB Renal Hormones_Virtual_Woo Fa 21 Lab Assignment 15 Name Type your answers to these questions here or on a separate sheet and save as a PDF for upload to Canvas 1. Define selective and obligatory reabsorption. (give an example of one molecule that is reabsorbed by BOTH methods and indicate where in the nephron each process occurs for that molecule) 2. Where in the nephron tubules does obligatory reabsorption take place and where in the nephron does hormonal control of reabsorption take place? 3. Prepare 3 graphs of the data averages from the experimental results provided on Google Docs for Lab 15A. One graph for the Effect of Salt and Water Loading on Urine Output over time. One graph for Effect of Salt and Water Loading on Sodium Chloride Concentration over time. One graph for Effect of Salt and Water Loading on Specific Gravity over Time. Write a short figure description that can be used for all three graphs. Save your graphs as a PDF and copy paste here. 4. Use the graphs you generated from the class data to answer the following: a. Describe the describe the trend over time for the Urine output over time for Each Group Salt: Water b. Describe the describe the trend over time for the salt concentration in the urine for Each Group Water: c. Describe the describe the trend over time for the specific gravity of the urine for Each Group Salt: Water: d. How are specific gravity and salt concentration related? Directly or indirectly e. How are specific gravity and urine output related? Directly or indirectly 1. What hormone was likely active in the salt group? g. What hormone was likely active in the water group? 5. Diabetes insipidus is a disorder whereby the kidneys cannot concentrate urine due to a defect in the ADH system. If there happened to be a student in the class with DI, how would the experiment conducted reveal them? Which group would they have been in to see this? Explain the results expected in a DI person compared to what you would find in a normal person Salt: 6. A. Calculate and record the highest percent change in the specific gravity over the course of the Google Doc experiment. Look for the highest and lowest average number in the salt group and the water group and use those two numbers to calculate the change. (In order to make this calculation meaningful, you must first get rid of the 1 and just use the XX value for example 1.024 becomes 0.024 for the calculation, show your work) B. Which group water or salt showed the higher percent change? 7. Explain osmotic diuresis and compare it to water diuresis. Why does osmotic diuresis but not water diuresis lead to constant thirst? 8. How can you tell the difference between the posterior and anterior pituitary tissue when looking at the micrograph? In other words, if you were trying to tell someone looking at the sample which is the AP and which is the PP what would you tell them to look for