|Modelprojekt, 1 + 2. modul, 2004, id:303|
|Findes på RUb:||Ja|
We wish to find the answer to the following question "How is the vascular system affected by the breating process?". We have created a model of the vascular system, by using energy band formalism and wish to determine how the change in pressure will affect the blood flow. We have used mechnical and electrical laws to create the model, and estimated the parameters of the model so that we would receive values of the pressure, flow and volume close to those of experimental data. Our model consists of (among other) two artery-vein branches, wich represent the chest and liver. The model contains two branches because the chest and the liver are affected in different ways by the breathing process. The breathing process itself is accounted for in a change in pressure in the elements of the model, and we have examined how big an effect the depth of the breath, the length of the breath and the ground pressure have on the vascular system. The ground pressure is the minimum pressure in the chest, which keeps the lungs from collapsing. Byh variation of the parameters that control the depth of the breath, the length of the breath and the ground pressure, we can examine their effects on the vascular system. We have found that the length of the breath has got no effect on the blood flow, while both the depth of the breath and the ground pressure has. Deep breathing and high ground pressure result in a bigger flow.