10/30/2020 PhysioEx Exercise 5 Activity 4 PhysioEx Lab Report Exercise 5: Cardiovascular Dynamics Activity 4: Studying the Eﬀect of Blood Pressure on Blood Flow Rate Name: Date: 30 October 2020 Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1 Pressure changes in the cardiovascular system primarily result from You correctly answered: changes in the force of contraction of the heart. 2 What is the driving force for blood ﬂow? You correctly answered: pressure gradient. 3 Which of the following is directly proportional to blood ﬂow? You correctly answered: blood vessel radius and pressure gradient. 4 Arteries close to the heart need to be able to compensate for You correctly answered: pressure changes. Experiment Results Predict Questions 1 Predict Question 1: What eﬀect do you think increasing the pressure will have on the ﬂuid ﬂow rate? Your answer: The ﬂuid ﬂow rate will increase. 2 Predict Question 2: 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: yes. Stop & Think Question 1 This experiment uses pressure changes to model You correctly answered: changes in the force of contraction of the heart. Experiment Data 1/3 10/30/2020 PhysioEx Exercise 5 Activity 4 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 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: increase ﬂow rate. 2 Blood pressure is measured in You correctly answered: mm Hg. 3 Which of the following variables has the greatest eﬀect on blood ﬂow? You correctly answered: vessel radius. 4 Blood ﬂow is measured in You correctly answered: ml/min. 2/3 10/30/2020 PhysioEx Exercise 5 Activity 4 Review Sheet Results 1 Explain the eﬀect that pressure changes had on ﬂow rate. How well did the results compare with your prediction? Your answer: With increased pressure, the ﬂow rate increases. 2 How does the plot diﬀer from the plots for tube radius, viscosity, and tube length? How well did the results compare with your prediction? Your answer: The plot between the ﬂow rate and pressure makes a straight line, only pressure among all factors. 3 Explain why pressure changes are not the best way to control blood ﬂow. Your answer: It has just proportion with ﬂow rate, while the fourth power of radius has proportion with ﬂow rate. 4 Use your data to calculate the increase in ﬂow rate in ml/min/mm Hg. Your answer: The increase in ﬂow rate is 1.4. 3/3