PhysioEx Exercise 9 Activity 2
4/1/22, 9:29 PM
PhysioEx Lab Report
Exercise 9: Renal System Physiology Activity 2: The Effect of Pressure on Glomerular Filtration
Name: Kyana Jackson
Date: 1 April 2022
Session ID: session-0ef00d4b-b752-151a-077d-ad7c88b9252f
Pre-Iab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly
1 Which of the following forces promotes filtration?
You correctly answered: blood pressure in the glomerular capillaries.
2 The glomerular filtration rate can be altered by
You correctly answered: changing the afferent arteriole resistance
3 In 24 hours human glomerular capillaries can filter as much as
liters of filtrate.
You correctly answered: 180.
4 Which of the following statements about the filtrate in the renal corpuscle is false?
You correctly answered: Normally, more than 4o% of the blood that enters the glomerular
capillaries becomes filtrate.
Experiment Results
Predict Questions
1 Predict Question 1: What will happen to the glomerular capillary pressure and filtration
rate if you increase the blood pressure in the left source beaker?
Your answer: Both pressure and filtration rate will increase.
2 Predict Question 2: What will happen to the filtrate pressure in Bowman's capsule (not
directly measured in this experiment) and filtration rate if you close the one-way valve
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PhysioEx Exercise 9 Activity 2
4/1/22, 9:29 PM
between the collecting duct and the urinary bladder?
Your answer: Pressure will increase and filtration rate will decrease
Stop & Think Questions
1 What is the important relation that underlies the observed increase in glomerular filtration rate when the blood pressure is increased?
You correctly answered: pressure and flow are directly proportional.
2 What medical condition is analogous to the closed valve?
You correctly answered: a tumor obstructing the renal tubule
Experiment Data
Afferent Radius (mm) 0.50
Efferent Radius (mm) 0.45
Beaker Press. (mm Hg) 70 80 90 100
Glomerular Press. (mm Hg) 49.72 52.40 55.08 57.76 49.72 49.72
Glom. Filt. Rate (ml/min) 58.57
Urine Volume (ml) 161.76
Valve Status
open open open open
0.50
0.45
91.78
186.23
0.50 0.50
0.45 0.45
124.99
200.44
158.20
209.72 161.76 0.00
0.50 0.50
0.45 0.45
70 70 100
58.57 26.94
open closed
0.50
0.45
57.76
116.20
0.00
closed
0.50
0.45
100
57.76
158.20
209.72
open
Post-Iab Quiz ResuIts
You scored 75% by answering 3 out of 4 questions correctly.
1 In humans, the glomerular filtration rate normally ranges from
You correctly answered: 80 to 140 ml/min
2 Which of the following does not have a significant impact on the glomerular filtration
rate?
Your answer: filtrate pressure in the renal tubule.
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PhysioEx Exercise 9 Activity 2
4/1/22, 9:29 PM
Correct answer: renal tubule length
3 In the absence of any regulatory mechanisms, what do you think would happen to the
glomerular filtration rate of a person who experiences an increase in blood pressure?
You correctly answered: The glomerular filtration rate could increase
4 What would happen to the glomerular filtration rate of a person who experiences a large hemorrhage?
You correctly answered: The glomerular