11-04-2008, 02:17 PM
hi upin, its based on the concept that when u add resistance in series the tpr increases,upstream press i.e arterial bp increases, downstream pressure decreases and the blood flow decereses.
But when u add a resistance in parallel like say in obesity and by addition of placenta in the pregnant women then the tpr decreases as a result the blood flow or the cardiac output increses to meet the metabolic demand in pregnancy and obesity and ther by bp is maintained. Therefore when the perfusion pressure is same for the organs connected in parallel than definetely u can indepently regulate the blood flow in 2 organs which r connected in parallel. and any one organ of the 2 connected in parallel having low blood flow shows that it has high resistance.
But when u add a resistance in parallel like say in obesity and by addition of placenta in the pregnant women then the tpr decreases as a result the blood flow or the cardiac output increses to meet the metabolic demand in pregnancy and obesity and ther by bp is maintained. Therefore when the perfusion pressure is same for the organs connected in parallel than definetely u can indepently regulate the blood flow in 2 organs which r connected in parallel. and any one organ of the 2 connected in parallel having low blood flow shows that it has high resistance.
