Do you think a graph plotted with pressure on the X-axis and flow rate on the Y-axis will be linear (a straight line)? Your answer : a. yes Stop & Think Questions: This experiment uses pressure changes to model You correctly answered: c. changes in the force of contraction of the heart. Experiment Data: Flow (ml/min) Radius (mm) Viscosity Length (mm) Pressure (mm Hg) 35.0 5.0 3.5 50 25 70.1 5.0 3.5 50 50 105.1 5.0 3.5 50 75 140.2 5.0 3.5 50 100 175.2 5.0 3.5 50 125 210.3 5.0 3.5 50 150 245.3 5.0 3.5 50 175 280.4 5.0 3.5 50 200
01/23/15 page 3 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. The effect of increasing pressure was to You correctly answered: b. increase flow rate. 2. Blood pressure is measured in You correctly answered: c. mm Hg. 3. Which of the following variables has the greatest effect on blood flow? You correctly answered: d. vessel radius 4. Blood flow is measured in You correctly answered: a. ml/min.
01/23/15 page 4 Review Sheet Results 1. Explain the effect that pressure changes had on flow rate. How well did the results compare with your prediction? 2. How does the plot differ from the plots for tube radius, viscosity, and tube length? How well did the results compare withyour prediction? 3. Explain why pressure changes are not the best way to control blood flow.Your answer: 4. Use your data to calculate the increase in flow rate in ml/min/mm Hg. Your answer: The increase in flow rate is 1.4013 ml/min/mm Hg as calculated by the change in flow rate divided by the change in pressure.
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