A+PII Lab 3 - 5. I increased the right flow tube radius in...

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11/28/07 Anatomy and Physiology II Studying the Effect of Radius on Pump Activity Objective: To study the effects of the radius of the pulmonary veins and the aorta on pump volume and rate. Methods: 1. Using a pump mechanics simulator, I set the right flow tube (aorta) radius to 2.5mm and the left flow tube (pulmonary veins) radius to 3.0mm 2. I set the left beaker pressure to 40 mm Hg, the right beaker pressure to 80 mm Hg, the pump pressure to 120 mm Hg, start volume in the pump to120 ml , end volume in the pump to 50 Ml, and maximum strokes to 10. All of these values were kept constant throughout the entire experiment 3. I then activated the pump mechanics simulator and watched the 10 stroke volumes, recording both flow and rate 4. I then refilled the left beaker
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Unformatted text preview: 5. I increased the right flow tube radius in increments of 0.5mm and repeated step 3 until a radius of 6.0mm was reached recording the results each time Results: (See attached pages) Discussion: As the right flow tube radius was increased the fluid flow rate also increased. The pump rate also increased because the resistance to fluid flow was decreased. These results suggest that the heart must contract less forcefully if the resistance to the blood flow in the right flow tube (aorta) is increased. By contrast, constricting the blood vessels entering the heart (pulmonary veins) would increase the time needed to fill the heart chambers. Decreasing the left flow tube radius would also decrease the flow rate and pump rate and vice versa....
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