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Venous Pooling is also called as Venous distension. It is the distension on the venous side of circuit due to the difference of the resistance and the fluid volume within each vessels. For example, let's consider there are U shpe tubes as vessels. In a U tubes with a distensible section at the bend, inflow and outflow pressures are the same but the resistance to flow and the fluid volume contained in each tube vary with the orientation of the tube. Especially, if the tube is oriented with its bend downward increases the flow. It is because the cardiovascular system we have is a closed circuit of constant blood, as contrast to U-tube which is an open circuit with a fluid of unlimitedvolume. In the dependent regions of the cardiovascular system, the distension will occur more on the venous than on the arterial side of the circuit, because the venous compliance is so much greater than the arterial compliance. Such case can be explained when the arms are allowed to hang down the venous pooling is readily observed on the back of hands. This venous distension represents those caused by the hemorrhage of an equivalent volume of blood from the body.
Why does the distension occur more on the venous than the arterial side of the circuit?
Because the venous compliance is much greater than the arterial compliance.
For more information on this topic, please refer to Berne & Levy , Pages 214-216
Also, check out the following links that may be helpful:
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This page was written by Sang Ho Ma, #612-58-5771 firstname.lastname@example.org , a student in this course.
BME 403 Pages maintained by the T.A., Douglas Miles.