Cardiovascular DynamicsR E V I E W S H E E T Chapter 5
Vessel Resistance
6. Describe the relationship between flow rate and viscosity. _____________________________
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7. Was the effect of viscosity greater or less than the effect of radius on fluid flow? Why? _____________________________
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8. What effect would anemia have on blood flow? Why? _____________________________
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The following questions refer to Activity 3: Studying the Effect of Flow Tube Length on Fluid Flow.
9. At what flow tube length was the flow rate the highest? _____________________________
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10. Describe the relationship between flow tube length and fluid flow rate. _____________________________
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11. What effect do you think obesity would have on blood flow? Why? _____________________________
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The following questions refer to Activity 4: Studying the Effect of Pressure on Fluid Flow.
12. What effect did increased pressure have on the fluid flow rate? _____________________________
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13. In the body, where does the driving pressure for fluid flow come from? _____________________________
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Pump MechanicsThe following questions refer to Activity 5: Studying the Effect of Radius on Pump Activity.
14. What happened to the flow rate as the right vessel radius was increased? _____________________________
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15. What happened to the rate (strokes/min) as the right vessel radius was increased?
Why did this occur? _____________________________
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The following questions refer to Activity 6: Studying the Effect of Stroke Volume on Pump Activity.
16. At what stroke volume tested was the pump rate the lowest? _____________________________
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17. Describe the relationship between stroke volume and pump rate. _____________________________
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18. Use the relationship in question 17 to explain why an athlete’s resting heart rate would be lower than that of a sedentary
individual. _____________________________
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The following questions refer to Activity 7: Studying Combined Effects.
19. How did decreasing the left flow tube radius affect pump chamber filling time? Hint: Look at the change in flow rate and
relate this to filling time. _____________________________
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20. When the left beaker pressure was decreased to 10 mm Hg, what happened to the filling time? ________________________
The following questions refer to Activity 8: Studying Compensation.
21. With the right flow tube radius decreased to 2.5 mm, what conditions did you change to bring the flow rate back to
normal? _____________________________
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22. Adecreased tube radius is analogous to atherosclerosis (plaque formation in vessels). Describe the effect this would have on
resistance in the arterial system and how the human heart might compensate for this change. _________________________
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