PhysioEX Exercise 5.1
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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: Kinsey Clark
Date: 13 September 2023
Session ID: session-25cf318a-be39-96e4-db1f-d806e760043b
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
Experiment Results
Predict Questions
Stop & Think Questions
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?
You correctly answered:
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:
no.
2
9/13/23, 2:47 PM
PhysioEx Exercise 5 Activity 1
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Experiment Data
Flow Rate
(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
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
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
The variable that you altered in this activity was
You correctly answered:
vessel radius.
1
Vessel radius and fluid flow
2
9/13/23, 2:47 PM
PhysioEx Exercise 5 Activity 1
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Review Sheet Results
You correctly answered:
are directly proportional.
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:
The body establishes a pressure gradient, specific for fluid flow, by the diameter of blood
vessels, which essentially controls blood flow. All fluids move from an area of higher fluid
pressure to an area of lower fluid pressure. The blood vessels contract in one area and
dilate in another area to direct blood flow.
The pressure gradient is a combination of heart's
pumping action, the varying resistance in blood vessels, the contraction of muscles, and the
presence of one-way valves in certain vessels.
1
Explain the effect that the flow tube radius change had on flow rate. How well did the results
compare with your prediction?
Your answer:
As the radius increases the flow of blood will also increase, therefore when the the radius
decreases, as the flow of blood will decrease.
When we increased the flow tube radius from
1.5 mm to 2.0 mm, the flow rate increased from 4.0 ml/min to 12.6 ml/min. My prediction
was correct.
2
Describe the effect that radius changes have on the laminar flow of a fluid.
Your answer:
Increasing the radius leads to higher flow rates and smoother laminar flow, while decreasing
the radius results in reduced flow rates and potentially the onset of turbulent flow.
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:
4
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PhysioEx Exercise 5 Activity 1
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The plot was not linear because the expansion of the blood vessel's radius led to a
proportional and rapid surge in the blood flow rate.
With a radius of 1.5 mm the flow rate
was 4.0 ml/min, but the flow rate jumped dramatically to 12.6 ml/min when we only
increased the radius by 0.5 mm.
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In fluid mechanics, the equation that models the fluid level in a tank is:
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(ソーリ
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(v) actual spring rate.
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Step III Numa
From Eq.…
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MEC 451 - THERMODYNAMICS
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The pressure in an automobile tire depends on the temperature of the air
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[ 26 kPa, 0.007 kg]
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% Orbital elements obtained from TLE
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A 6 4 2:57 PM Lucky CORER 144 Tum lock 314 % 8 1/2 24 6 1/4 23 T K F pause Barrow_forwardI need help with my MATLAB code. I am trying to plot the semi major axis and eccentricity with the following code with rungge kutta method. I have two different nnn's in the code which produce two different step sizes. So, I am wondering why both give the same exact plots for semi-major axis and eccentricity. 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