PhysioEx 9.0 Review Sheet Exercise 5 Questions
I noticed that several people asked for these questions and answers, so I compiled a list of all the questions along with all the answers I had available to me. Please feel free to add the answers that you know, as well as make corrections to the ones that I had on hand. I will try to post more answers later.
Activity 1:1: Explain how the body established a pressure gradient for fluid flow.
Answer: The body establishes a pressure gradient for fluid flow due to the pressure difference between the two ends of the vessel.
2: Explain the effect that the flow tube radius change had on flow rate. How well did the results compare with your prediction?
Answer: Increasing the flow tube radius resulted in an increase in the flow rate. It corresponded with my prediction.
3: Describe the effect that radius changes have on the laminar flow of a fluid.
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4: 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?
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Activity 2:1 (5): Describe the components in the blood that affect viscosity.
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2 (6): Explain the effect that viscosity had on flow rate. How well did the results compare with your prediction?
Answer: The higher the viscosity the lower the flow = an inverse relationship.
3 (7): Describe the graph of flow versus viscosity.
Answer: Viscosity has a lower effect than radius on fluid flow because flow is directly proportional to the radius to the fourth power
4 (8): Discuss the effect that polyethemia would have on viscosity and blood flow.
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Activity 3:1 (9): Which is more likely to occur, a change in blood vessel radius or a change in blood vessel length? Explain why.
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2 (10): Explain the effect that the change in blood vessel length had on flow length. How well did the results compare with your prediction?
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3 (11): Explain why you think blood vessel radius can have a larger effect on the body than changes in blood vessel length (use the blood flow equation).
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4 (12): Describe the effect that obesity would have on blood flow and why.
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Activity 4:1 (13): Explain the effect that pressure changes had on flow rate. How well did the results compare with your prediction?
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2 (14): How does the plot differ from the plots for tube radius, viscosity, and tube length? How well did the results compare with your prediction?
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3 (15): Explain why pressure changes are not the best way to control blood flow.
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4(16): Use your data to calculate the increase in flow rate in ml/min/mm Hg.
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Activity 5:1 (17): Explain the effect of increasing the right flow tube radius on the flow rate, resistance, and pump rate.
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2 (18): Describe what left and right beakers in the experiment correspond to in the human heart.
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3 (19): Briefly describe how the human heart could compensate for flow rate changes to maintain blood pressure.
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Activity 6:1 (20): Describe the Frank-Starling law in the heart.
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2 (21): Explain what happened to the pump rate when you increased the stroke volume. Why do you think this occurred? How well did the results compare with your prediction?
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3 (22): Describe how the heart alters stroke volume.
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4 (23): Describe the intrinsic factors that control stroke volume
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Activity 7:1 (24): Explain how the heart could compensate for changes in peripheral resistance.
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2 (25): Which mechanism has the greatest compensatory effect? How well did the results compare with your prediction?
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3 (26): Explain what happened when the pump pressure and the beaker pressure were the same. How well did the results compare with your prediction?
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4 (27): Explain whether it would be better to adjust heart rate or blood vessel diameter to achieve blood flow changes at a local level (for example, in just the digestive system).
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