BIO 139 KCTCS EXAM SCRIPT 2026
COMPLETE QUESTIONS AND CORRECT
ANSWERS
◉ 3 Which of the following would not result in a decrease in the blood
vessel radius?
You correctly answered: vasodilation. Answer: 4 The diameter of the
blood vessel is the same as
You correctly answered: 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: lumen. Answer: 1 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.
◉ 2 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. Answer: 1 What is the driving force for blood flow?
You correctly answered: pressure gradient.
◉ 2 How does the body increase the blood vessel radius?
,Correct answer: smooth muscle relaxation Answer: The variable that you
altered in this activity was
You correctly answered: vessel radius.
◉ 2 Vessel radius and fluid flow
You correctly answered: are directly proportional. Answer: 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: constricted, dilated.
◉ 4 When you increased the flow tube radius, the fluid flow rate You
correctly answered: increased. Answer: 1 Explain how the body
establishes a pressure gradient for fluid flow.
Your answer:
Is by the principle of pressure difference at the terminal end of blood
vessels.
◉ 2 Explain the effect that the flow tube radius change had on flow rate.
How well did the results compare with your prediction?
Your answer:
The flow rate is directly proportional to the flow tube radius. Increasing
the radius also increases the flow rate. Answer: 3 Describe the effect that
radius changes have on the laminar flow of a fluid.
Your answer:
,The laminar flow is directly proportional to the radius. The larger the
radius, the greater is the laminar flow.
◉ 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?
Your answer:
It was not linear because the increase in the radius results in an
enormous increase in the flow rate. Answer: 1 Which of the following is
not a formed element?
You correctly answered: plasma protein.
◉ 2 Thrombocytopenia is a reduction in platelets. What effect do you
think this could have on blood viscosity?
You correctly answered: decrease blood viscosity. Answer: 1 Which of
the following does not contribute to the viscosity of the blood?
You correctly answered: oxygen level in the blood.
◉ 1 Viscosity most directly affects
You correctly answered: peripheral resistance Answer: Predict Question:
What effect do you think increasing the viscosity will have on the fluid
flow rate?
Your answer: The fluid flow rate will decrease.
, ◉ 1 What is the relationship between fluid flow and viscosity?
You correctly answered: They are inversely proportional to each other.
Answer: 2 What effect do you think aplastic anemia (reduced red blood
cells) would have on blood flow?
You correctly answered: increased blood flow due to decreased
viscosity.
◉ The variable that you altered in this activity was
You correctly answered: viscosity. Answer: 2 Increasing viscosity
resulted in
You correctly answered: decreased flow rate.
◉ 3 What effect would a decreased hematocrit have on blood flow?
You correctly answered: decreased viscosity, increased flow. Answer: 4
What do you predict would be the overall affect on viscosity during
dehydration?
You correctly answered: increased viscosity, decreased flow.
◉ 1 Describe the components in the blood that affect viscosity.
Your answer:
Plasma proteins, white blood cells, red blood cells, and platelets in the
blood. Answer: 2 Explain the effect that the viscosity change had on
flow rate. How well did the results compare with your prediction?
Your answer:
COMPLETE QUESTIONS AND CORRECT
ANSWERS
◉ 3 Which of the following would not result in a decrease in the blood
vessel radius?
You correctly answered: vasodilation. Answer: 4 The diameter of the
blood vessel is the same as
You correctly answered: 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: lumen. Answer: 1 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.
◉ 2 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. Answer: 1 What is the driving force for blood flow?
You correctly answered: pressure gradient.
◉ 2 How does the body increase the blood vessel radius?
,Correct answer: smooth muscle relaxation Answer: The variable that you
altered in this activity was
You correctly answered: vessel radius.
◉ 2 Vessel radius and fluid flow
You correctly answered: are directly proportional. Answer: 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: constricted, dilated.
◉ 4 When you increased the flow tube radius, the fluid flow rate You
correctly answered: increased. Answer: 1 Explain how the body
establishes a pressure gradient for fluid flow.
Your answer:
Is by the principle of pressure difference at the terminal end of blood
vessels.
◉ 2 Explain the effect that the flow tube radius change had on flow rate.
How well did the results compare with your prediction?
Your answer:
The flow rate is directly proportional to the flow tube radius. Increasing
the radius also increases the flow rate. Answer: 3 Describe the effect that
radius changes have on the laminar flow of a fluid.
Your answer:
,The laminar flow is directly proportional to the radius. The larger the
radius, the greater is the laminar flow.
◉ 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?
Your answer:
It was not linear because the increase in the radius results in an
enormous increase in the flow rate. Answer: 1 Which of the following is
not a formed element?
You correctly answered: plasma protein.
◉ 2 Thrombocytopenia is a reduction in platelets. What effect do you
think this could have on blood viscosity?
You correctly answered: decrease blood viscosity. Answer: 1 Which of
the following does not contribute to the viscosity of the blood?
You correctly answered: oxygen level in the blood.
◉ 1 Viscosity most directly affects
You correctly answered: peripheral resistance Answer: Predict Question:
What effect do you think increasing the viscosity will have on the fluid
flow rate?
Your answer: The fluid flow rate will decrease.
, ◉ 1 What is the relationship between fluid flow and viscosity?
You correctly answered: They are inversely proportional to each other.
Answer: 2 What effect do you think aplastic anemia (reduced red blood
cells) would have on blood flow?
You correctly answered: increased blood flow due to decreased
viscosity.
◉ The variable that you altered in this activity was
You correctly answered: viscosity. Answer: 2 Increasing viscosity
resulted in
You correctly answered: decreased flow rate.
◉ 3 What effect would a decreased hematocrit have on blood flow?
You correctly answered: decreased viscosity, increased flow. Answer: 4
What do you predict would be the overall affect on viscosity during
dehydration?
You correctly answered: increased viscosity, decreased flow.
◉ 1 Describe the components in the blood that affect viscosity.
Your answer:
Plasma proteins, white blood cells, red blood cells, and platelets in the
blood. Answer: 2 Explain the effect that the viscosity change had on
flow rate. How well did the results compare with your prediction?
Your answer:
