PhysioEx Exercise 5 Activity 7

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Jun 26, 2024

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PhysioEx Lab Report Exercise 5: Cardiovascular Dynamics Activity 7: Compensation in Pathological Cardiovascular Conditions Name: Tania Chaney Date: 12 June 2024 Session ID: session-e2e242bd-0797-8ae6-4d61-109b02b44d72 Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Experiment Results Predict Questions Stop & Think Questions Which of the following could cause an increase in peripheral resistance in the blood vessel? You correctly answered: atherosclerosis. 1 Which structures in the heart ensure that one-way fl ow occurs? You correctly answered: valves. 2 Which of the following might be seen in both the diseased heart and the athlete's heart? You correctly answered: thicker myocardium. 3 The type of resistance increased in aortic valve stenosis is You correctly answered: increased left-ventricular afterload. 4 Predict Question 1: You will now test three mechanisms to compensate for the decrease in fl ow rate caused by the decreased fl ow tube radius. Which mechanism do you think will have the greatest compensatory e ff ect? Your answer: decreasing the pressure in the right (destination) beaker. 1 Predict Question 2: What do you think will happen if the pump pressure and the beaker pressure are the same? Your answer: Flow will stop. 2 PhysioEx Exercise 5 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act7/ 1 of 3 6/12/2024, 6:51 PM
Experiment Data Condition Flow (ml/ min) Rad. L (mm) Rad. R (mm) Str. V (ml) Rate (strokes/min) Press. L (mm Hg) Press. Dif. R (mm Hg) Normal 5086.8 3.0 3.0 70 72.7 40 40 Aortic stenosis 3310.0 3.0 2.5 70 47.3 40 40 Increased preload 3892.9 3.5 2.5 70 55.6 40 40 Increased preload 4256.7 4.0 2.5 70 60.8 40 40 Increased preload 4479.5 4.5 2.5 70 64.0 40 40 Increased contractility 3826.3 3.0 2.5 70 54.7 40 50 Increased contractility 4270.3 3.0 2.5 70 61.0 40 60 Increased contractility 4656.3 3.0 2.5 70 66.5 40 70 Decreased afterload 3826.3 3.0 2.5 70 54.7 40 50 Decreased afterload 4270.3 3.0 2.5 70 61.0 40 60 Decreased afterload 4656.3 3.0 2.5 70 66.5 40 70 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Narrowing of the right fl ow tube radius simulates You correctly answered: aortic valve stenosis. 1 What does increasing the pump pressure correspond to in the human heart? You correctly answered: increasing the force of contraction. 2 What does decreasing the right (destination) beaker correspond to in the human heart? You correctly answered: decreasing afterload. 3 Which of the following compensatory mechanisms was not tested? 1 PhysioEx Exercise 5 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act7/ 2 of 3 6/12/2024, 6:51 PM
Review Sheet Results You correctly answered: decreasing the pressure in the left (source) beaker. In an actual heart, what is the most logical way to compensate for a decrease in fl ow tube radius? You correctly answered: adjust the force of contraction of the heart. 2 Without a di ff erence in pressure between the pump and the destination beaker You correctly answered: the valve will not open. 3 Athletes experience an overall __________ in peripheral resistance, so the heart generates __________ pressure to deliver the same amount of blood. An athlete's arterial pressure would likely be __________ than that in a non-athlete. You correctly answered: decrease, less, lower. 4 Explain how the heart could compensate for changes in peripheral resistance. Your answer: increase will cause heart rate to increase to try to keep the same amount of blood to pump. 1 Which mechanism had the greatest compensatory e ff ect? How well did the results compare with your prediction? Your answer: It looks like I was correct, decreasing the pressure in the right beaker had the greatest compensatory e ff ect. 2 Explain what happened when the pump pressure and the beaker pressure were the same. How well did the results compare with your prediction? Your answer: The fl ow did stop. 3 Explain whether it would be better to adjust heart rate or blood vessel diameter to achieve blood fl ow changes at a local level (for example, in just the digestive system). Your answer: The heart will be less likely to strain if you adjust the blood vessel diameter. 4 PhysioEx Exercise 5 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex5/act7/ 3 of 3 6/12/2024, 6:51 PM
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