Renal System Physiology Physioex 9.0 Activity 1

Topics: Glomerulus, Kidney, Nephron, Urine / Pages: 3 (596 words) / Published: Apr 4th, 2014
Exercise 9: Renal System Physiology: Activity 1: The Effect of Arteriole Radius on Glomerular Filtration Lab Report
Pre-lab Quiz Results
You have not completed the Pre-lab Quiz.

03/31/14

page 1

Experiment Results
Predict Question:
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 : b. Both pressure and filtration rate will decrease.
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 : a. Both pressure and filtration rate will increase.
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 : d. Pressure will increase and filtration rate will decrease.
Stop & Think Questions:
Caffeine consumption leads to increased urine formation. From the results in this experiment thus far, you might propose that You correctly answered: d. caffeine dilates the afferent arteriole.
When you are in the desert and dehydrating, which of the following arteriole combinations would benefit you the most?
You correctly answered: c. afferent constriction and efferent dilation
Experiment Data:
Afferent Radius
(mm)
0.50
0.45
0.40
0.35
0.55
0.60
0.50
0.50
0.50

Efferent Radius
(mm)
0.45
0.45
0.45
0.45
0.45
0.45
0.45
0.40
0.35

Beaker Press.
(mm Hg)
90
90
90
90
90
90
90
90
90

03/31/14

Glomerular Press.
(mm Hg)
55.08
51.54
48.52
46.16
58.94
62.88
55.08
56.10
56.84

page 2

Glom. Filt. Rate
(ml/min)
124.99
81.06
43.66
14.35
172.86
221.69
124.99
137.69
146.82

Urine Volume
(ml)
200.44
179.88
143.91
76.33
212.87
220.74
200.44
227.49
247.96

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. If you increase the afferent arteriole radius

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