PhysioEx Exercise 5 Activity 1
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Subject
Aerospace Engineering
Date
Dec 6, 2023
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3
Uploaded by ElderElementPheasant34
10/26/23, 8:11 PM
PhysioEx Exercise 5 Activity 1
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PhysioEx Lab Report
Exercise 5: Cardiovascular Dynamics
Activity 1: Studying the Effect of Blood Vessel Radius on Blood Flow Rate
Name: Hayley Johnson
Date: 26 October 2023
Session ID: session-d78fb32e-3fa4-3564-9dba-06bf12eea108
Pre-lab Quiz Results
You scored 80% by answering 4 out of 5 questions correctly.
Experiment Results
Predict Questions
Stop & Think Questions
Experiment Data
Flow Rate (ml/min)
Radius (mm)
Viscosity
Length (mm)
Pressure (mm Hg)
4.0
1.5
1.0
50
100
Blood flow is measured in
You correctly answered:
ml/min.
1
Which of the following has the greatest effect on blood flow?
You correctly answered:
blood vessel radius.
2
Which of the following would
not
result in a decrease in the blood vessel radius?
Your answer:
contraction of smooth muscle in the arterial wall.
Correct answer:
vasodilation.
3
The diameter of the blood vessel is the same as
You correctly answered:
two times the radius of the blood vessel.
4
The opening of the blood vessel where the blood flows is called the
You correctly answered:
lumen.
5
Predict Question 1: What do you think will happen to the flow rate if the radius is increased by 0.5 mm?
Your answer:
The flow rate will increase.
1
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:
yes.
2
What is the driving force for blood flow?
You correctly answered:
pressure gradient.
1
How does the body increase the blood vessel radius?
You correctly answered:
smooth muscle relaxation.
2
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PhysioEx Exercise 5 Activity 1
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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
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
Review Sheet Results
The variable that you altered in this activity was
You correctly answered:
vessel radius.
1
Vessel radius and fluid flow
You correctly answered:
are directly proportional.
2
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:
constricted, dilated.
3
When you increased the flow tube radius, the fluid flow rate
You correctly answered:
increased.
4
Explain how the body establishes a pressure gradient for fluid flow.
Your answer:
A pressure gradient or fluid flow is established from vessel radius. An increase in vessel radius will result in an
increase in flow. A decrease in vessel radius will result in a decrease in flow or more pressure.
Vasoconstriction would decrease vessel radius and blood flow while vasodialation will do the opposite.
1
Explain the effect that the flow tube radius change had on flow rate. How well did the results compare with your
prediction?
2
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PhysioEx Exercise 5 Activity 1
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Your answer:
My prediction was correct, as I predicted that as vessel radius increases so will blood flow. Even with an
increase of vessel radius of just 0.5mm, the blood flow rate increased.
Describe the effect that radius changes have on the laminar flow of a fluid.
Your answer:
The effect of vessel radius has on laminar flow is the rate of flow which could lead to increased or decreased
pressure.
3
Why do you think the plot was not linear? (Hint: look at the relationship of the variables in the equation). How well
did the results compare with your prediction?
Your answer:
The relationship between vessel radius and blood flow is not a linear relationship, but a proportional
relationship in the 4th power.
4
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