Name: lab 6 act 1
Exercise 5: Cardiovascular Dynamics: Activity 1: Studying the Effect of Blood Vessel Radius on Blood Flow Rate Lab Report
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1.
Blood flow is measured in
You correctly answered: b. ml/min.
2.
Which of the following has the greatest effect on blood flow?
You correctly answered: a. blood vessel radius
3.
Which of the following would
not
result in a decrease in the blood vessel radius?
You correctly answered: c. vasodilation
4.
The diameter of the blood vessel is the same as
You correctly answered: b. two times the radius of the blood vessel.
5.
The opening of the blood vessel where the blood flows is called the
You correctly answered: b. lumen.
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Experiment Results
Predict Question:
Predict Question 1:
What do you think will happen to the flow rate if the radius is increased by 0.5 mm?
Your answer : b. The flow rate will increase.
Predict Question 2:
Do you think a graph plotted with radius on the X-axis and flow rate on the Y-axis will be linear (a
straight line)?
Your answer : b. no
Stop & Think Questions:
What is the driving force for blood flow?
You correctly answered: b. pressure gradient
How does the body increase the blood vessel radius?
You correctly answered: c. smooth muscle relaxation
Experiment Data:
Flow (ml/min)
Radius (mm)
Viscosity
Length (mm)
Pressure (mm Hg)
4.0
1.5
1.0
50
100
12.6
2.0
1.0
50
100
30.7
2.5
1.0
50
100
63.6
3.0
1.0
50
100
117.8
3.5
1.0
50
100
201.0
4.0
1.0
50
100
321.9
4.5
1.0
50
100
490.6
5.0
1.0
50
100
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Post-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
1.
The variable that you altered in this activity was
You correctly answered: c. vessel radius.
2.
Vessel radius and fluid flow
Your answer: a. are inversely proportional.
Correct answer: b. are directly proportional.
3.
After a heavy meal, when we are relatively inactive, we might expect blood vessels in the skeletal muscles to be
somewhat __________ and the blood vessels in the digestive organs to be somewhat __________.
You correctly answered: d. constricted, dilated
4.
When you increased the flow tube radius, the fluid flow rate
You correctly answered: a. increased.
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page 5
Review Sheet Results
1. Explain how the body establishes a pressure gradient for fluid flow.Your answer:
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