3. Describe how the heart alters stroke volume. 4. Describe the intrinsic factors that control stroke volume.

Name: Rebecca Palacios Exercise 5: Cardiovascular Dynamics: Activity 7: Compensation in Pathological Cardiovascular Conditions Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Which of the following could cause an increase in peripheral resistance in the blood vessel? 2. Which structures in the heart ensure that one-way flow occurs? 3. Which of the following might be seen in both the diseased heart and the athlete's heart? 4. The type of resistance increased in aortic valve stenosis is 04/16/16 page 1

04/16/16 page 2 Experiment ResultsPredict Question:Predict Question 1: You will now test three mechanisms to compensate for the decrease in flow rate caused by thedecreased flow tube radius. Which mechanism do you think will have the greatest compensatory effect? Predict Question 2: What do you think will happen if the pump pressure and the beaker pressure are the same? Stop & Think Questions:Narrowing of the right flow tube radius simulates What does increasing the pump pressure correspond to in the human heart? What does decreasing the right (destination) beaker correspond to in the human heart? Experiment Data: Condition Flow Rad. L Rad. R Str. V Rate Press. L Press. Dif. R 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 Decreased contractility 4656.3 3.0 2.5 70 66.5 40 70 Decreased afterload 3826.3 3.0 2.5 70 54.7 40 80 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