CHAPTER 1
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ACTIVITIES > PROBLEMS > PROBLEM 141 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11| 12 | 13 | 14 | 15 | 16
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14 |
The heart as an intermittently working pump |
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In contrast to many modern industrial pumps, the heart works not as a flow-pump ( Problem 12) but intermittently. It takes up blood from the left (or right) atrium into the left (or right) ventricle, closes all the valves, contracts, and increases the pressure of the fluids. Then the blood is ejected, for example from the left ventricle into the aorta from where it flows through the body.Data is given in graphical form for the volume of blood and the pressure of blood in the left ventricle for (a little more than) a cardiac cycle of a sheep (see diagram; data is given in tabular form in PV_Sheep_Ventricle. ). Pressure is from measurements, volume is from a dynamical model.
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at the end of ejection of blood). Calculate the elastances of the heart for these phases (see Internet Link).
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