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PhysioEx Exercise 9 Activity 2
Physiology Lab (BIO302L)
Chatham University
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PhysioEx Lab Report
Exercise 9: Renal System Physiology Activity 2: The Effect of Pressure on Glomerular Filtration Name: Miranda Date: 6 November 2019 Session ID: session-48321090-da9e-bb65-4af6-e7ef47cca7df
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
Experiment Results
Predict Questions
Stop & Think Questions
Which of the following forces promotes filtration? You correctly answered: blood pressure in the glomerular capillaries.
1
The glomerular filtration rate can be altered by You correctly answered: changing the afferent arteriole resistance.
2
In 24 hours human glomerular capillaries can filter as much as __________ liters of filtrate. You correctly answered: 180.
3
Which of the following statements about the filtrate in the renal corpuscle is false? You correctly answered: Normally, more than 40% of the blood that enters the glomerular capillaries becomes filtrate.
4
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.
1
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 between the collecting duct and the urinary bladder? Your answer: Pressure will increase and filtration rate will decrease.
2
Experiment Data Afferent Radius (mm)
Efferent Radius (mm)
Beaker Press. (mm Hg)
Glomerular Press. (mm Hg) Glom. Filt. Rate (ml/min)
Urine Volume (ml)
Valve Status 0 0 70 49 58 161 open 0 0 80 52 91 186 open 0 0 90 55 124 200 open 0 0 100 57 158 209 open 0 0 70 49 58 161 open 0 0 70 49 26 0 closed 0 0 100 57 115 0 closed 0 0 100 57 158 209 open
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
Review Sheet Results
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.
1
What medical condition is analogous to the closed valve? You correctly answered: a tumor obstructing the renal tubule.
2
In humans, the glomerular filtration rate normally ranges from You correctly answered: 80 to 140 ml/min.
1
Which of the following does not have a significant impact on the glomerular filtration rate? You correctly answered: renal tubule length.
2
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.
3
What would happen to the glomerular filtration rate of a person who experiences a large hemorrhage? You correctly answered: The glomerular filtration rate would decrease.
4
was closed, compared to open. This is because there is already filtrate in the bladder because there was no urinary output, therefore the system is not able to filtrate more. How did increasing the blood pressure alter the results when the valve was closed? Your answer: Whenever the blood pressure was increased while the valve was closed, it mainly effected the glomerular filtration rate. The glomerular filtration rate decreased because there was no urinary output. This filtration rate is decreased because the glomerular pressure stays the same and is overloading the filtration system causing to move at a slower rate.
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PhysioEx Exercise 9 Activity 2
Course: Physiology Lab (BIO302L)
University: Chatham University
