Physio Ex Exercise 9 Activity 1 PDF

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11/1/2020

PhysioEx Exercise 9 Activity 1

PhysioEx Lab Report Exercise 9: Renal System Physiology Activity 1: The Effect of Arteriole Radius on Glomerular Filtration Name: Kaelyn Wozniak Date: 1 November 2020 Session ID: session-d5cc6d71-62e5-9b83-3b84-6452664c2bf3

Pre-lab Quiz Results You scored 80% by answering 4 out of 5 questions correctly. 1 There are approximately __________ nephrons in a healthy human kidney. You correctly answered: 1 × 10 6 2 Which of the following lists the anatomical structures in the correct order as they are encountered by the blood itself during the process of filtration? Your answer: afferent arteriole, glomerular capillary, Bowman's capsule. Correct answer: afferent arteriole, glomerular capillary, efferent arteriole. 3 Bowman's capsule is connected to the beginning of the You correctly answered: proximal convoluted tubule. 4 The functional unit of the kidney is the You correctly answered: nephron. 5 During the process of renal reabsorption, fluid and solutes move from the You correctly answered: renal tubule into the peritubular capillaries.

Experiment Results Predict Questions 1 Predict Question 1: What will happen to the glomerular capillary pressure and filtration rate if you decrease the radius of the afferent arteriole? Your answer: Both pressure and filtration rate will increase. 2 Predict Question 2: What will happen to the glomerular capillary pressure and filtration rate if you increase the radius of the afferent arteriole? Your answer: Both pressure and filtration rate will decrease. https://media.pearsoncmg.com/bc/bc 0media ap/physioex/10/ex9/act1/

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PhysioEx Exercise 9 Activity 1

3 Predict Question 3: What will happen to the glomerular capillary pressure and filtration rate if you decrease the radius of the efferent arteriole? Your answer: Both pressure and filtration rate will increase. Stop & Think Questions 1 Caffeine consumption leads to increased urine formation. From the results in this experiment thus far, you might propose that You correctly answered: caffeine dilates the afferent arteriole. 2 When you are in the desert and dehydrating, which of the following arteriole combinations would benefit you the most? You correctly answered: afferent constriction and efferent dilation. Experiment Data Afferent Radius (mm)

Efferent Beaker Press. Radius (mm) (mm Hg)

Glomerular Press. (mm Hg)

Glom. Filt. Urine Volume Rate (ml/min) (ml)

0.50

0.45

90

55.08

124.99

200.44

0.50

0.45

90

55.08

124.99

200.44

0.45

0.45

90

51.54

81.06

179.88

0.40

0.45

90

48.52

43.66

143.91

0.35

0.45

90

46.16

14.35

76.33

0.55

0.45

90

58.94

172.86

212.87

0.60

0.45

90

62.88

221.69

220.74

0.50

0.45

90

55.08

124.99

200.44

0.50

0.40

90

56.10

137.69

227.49

0.50

0.35

90

56.84

146.82

247.96

0.50

0.30

90

57.34

152.96

262.23

Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1 If you increase the afferent arteriole radius and keep all other variables constant, the glomerular filtration rate would You correctly answered: increase. 2 If you decrease the efferent arteriole radius and keep all other variables constant, the volume of urine flowing into the urinary bladder would https://media.pearsoncmg.com/bc/bc 0media ap/physioex/10/ex9/act1/

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PhysioEx Exercise 9 Activity 1

You correctly answered: increase. 3 If you increase the efferent arteriole radius and keep all other variables constant, the glomerular filtration rate would You correctly answered: decrease. 4 If you decrease the afferent arteriole radius and keep all other variables constant, the volume of urine flowing into the urinary bladder would You correctly answered: decrease.

Review Sheet Results 1 What are two primary functions of the kidney? Your answer: Excretion and regulation. 2 What are the components of the renal corpuscle? Your answer: Bowmans capsule, efferent arteriole. 3 Starting with the renal corpuscle, list the components of the renal tubule as they are encountered by filtrate. Your answer: Bowmans capsule, proximal convoluted tubule, loop of Henle, distal convoluted tubule, collecting duct. 4 Describe the effect of decreasing the afferent arteriole radius on glomerular capillary pressure and filtration rate. How well did the results compare with your prediction? Your answer: Afferent radius decreased, the pressure and filtration decreased. 5 Describe the effect of increasing the afferent arteriole radius on glomerular capillary pressure and filtration rate. How well did the results compare with your prediction? Your answer: When the afferent radius increased, the pressure and filtration increased.

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PhysioEx Exercise 9 Activity 1

6 Describe the effect of decreasing the efferent arteriole radius on glomerular capillary pressure and filtration rate. How well did the results compare with your prediction? Your answer: When efferent radius decreased, the pressure and filtration increased. 7 Describe the effect of increasing the efferent radius on glomerular capillary pressure and filtration rate. Your answer: When efferent radius increased, the pressure and filtration decreased.

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