[PhysioEX Chapter 5 exercise 2] PEX-05-02

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Exercise 5: Cardiovascular Dynamics: Activity 2: Studying the Effect of Blood Viscosity on Blood Flow Rate Lab Report

Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. Which of the following is not a formed element?
   You correctly answered: c. plasma protein
2. Thrombocytopenia is a reduction in platelets. What effect do you think this could have on blood viscosity?
   You correctly answered: b. decrease blood viscosity
3. Which of the following does not contribute to the viscosity of the blood?
   You correctly answered: d. oxygen level in the blood
4. Viscosity most directly affects
   You correctly answered: b. peripheral resistance.

Experiment Results

Predict Question:
Predict Question: What effect do you think increasing the viscosity will have on the fluid flow rate?
Your answer : c. The fluid flow rate will decrease.

Stop & Think Questions:
What is the relationship between fluid flow and viscosity?
You correctly answered: b. They are inversely proportional to each other.
What effect do you think aplastic anemia (reduced red blood cells) would have on blood flow?
You correctly answered: a. increased blood flow due to decreased viscosity

Experiment Data:
Flow (ml/min) Radius (mm) Viscosity Length (mm) Pressure (mm Hg)
490.6 5.0 1.0 50 100
245.3 5.0 2.0 50 100
163.5 5.0 3.0 50 100
122.7 5.0 4.0 50 100
98.1 5.0 5.0 50 100
81.8 5.0 6.0 50 100
70.1 5.0 7.0 50 100
61.3 5.0 8.0 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
   You correctly answered: a. viscosity.
2. Increasing viscosity resulted in
   You correctly answered: b. decreased flow rate.
3. What effect would a decreased hematocrit have on blood flow?
   You correctly answered: d. decreased viscosity, increased flow
4. What do you predict would be the overall affect on viscosity during dehydration?
   You correctly answered: b. increased viscosity, decreased flow

Review Sheet Results

1. Describe the components in the blood that affect viscosity.
   Your answer:
   Plasma preteins, white blood cell, red blood cell and platelets in the blood.
2. Explain the effect that the viscosity change had on flow rate. How well did the results compare with your prediction?
   Your answer:
   When viscosity increases, flow rate of blood decreses.
3. Describe the graph of flow versus viscosity.
   Your answer:
   Viscosity and flow rate have inverse proportion.
4. Discuss the effect that polycythemia would have on viscosity and on blood flow.
   Your answer:
   Polycythemia describe as incresing of red blood cell. So when red blood cell is increses viscosity of the blood is increses,
   finally flow rate is decreses.