Which of the following would not result in a decrease

3. Which of the following would not result in a decrease in the blood vessel radius?
4. The diameter of the blood vessel is the same as
5. The opening of the blood vessel where the blood flows is called the

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?
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)?
Stop & Think Questions:
What is the driving force for blood flow?
How does the body increase the blood vessel radius?
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

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. The variable that you altered in this activity was
2. Vessel radius and fluid flow
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

Review Sheet Results
1. Explain how the body establishes a pressure gradient for fluid flow.
2. Explain the effect that the flow tube radius change had on flow rate. How well did the results compare with your
prediction?
3. Describe the effect that radius changes have on the laminar flow of a fluid.
4. 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?