PhysioEX Exercise 5.1

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Jan 9, 2024

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9/13/23, 2:47 PM PhysioEx Exercise 5 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act1/ 1/4 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 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act1/ 2/4 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 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act1/ 3/4 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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9/13/23, 2:47 PM PhysioEx Exercise 5 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act1/ 4/4 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.