# Physioex 5:1

Topics: Fluid dynamics, Blood vessel, Fluid mechanics Pages: 2 (625 words) Published: March 3, 2013
Exercise 5: Cardiovascular Dynamics: Activity 1: Studying the Effect of Blood Vessel Radius on Blood Flow Rate Lab Report Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. 1. Blood flow is measured in You correctly answered: b. ml/min. 2. Which of the following has the greatest effect on blood flow? You correctly answered: a. blood vessel radius 3. Which of the following would not result in a decrease in the blood vessel radius? You correctly answered: c. vasodilation 4. The diameter of the blood vessel is the same as You correctly answered: b. 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: b. lumen.

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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? Your answer : b. The flow rate will increase. 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 : b. no Stop & Think Questions: What is the driving force for blood flow? You correctly answered: b. pressure gradient How does the body increase the blood vessel radius? Your answer : a. smooth muscle contraction Correct answer: c. smooth muscle relaxation Experiment Data: Flow (ml/min) 4.0 12.6 30.7 63.6 117.8 201.0 321.9 490.6 Radius (mm) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Viscosity 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Length (mm) 50 50 50 50 50 50 50 50 Pressure (mm Hg) 100 100 100 100 100 100 100 100

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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: c. vessel radius. 2. Vessel radius and fluid flow You correctly answered: b. are directly proportional. 3. After a heavy meal, when we are relatively inactive, we might expect blood vessels in the skeletal muscles...