Poiseuille's Law泊肃叶定律
The biggest surprise in the application of Poiseuille's law to fluid flow is the dramatic effect of changing the radius. 将泊肃叶定律应用于流体流动时，最令人惊讶的是半径的改变产生了显著的影响。
 A decrease in radius has an equally dramatic effect, as shown in blood flow examples. 半径的减小也有同样显著的影响，如血流例子所示。
Poiseuille's Law calculation泊肃叶定律计算 |
Index Poiseuille's law concepts 索引 埃奥菲定律概念 | ||
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Blood Flow Examples血液流动示例
 Calculation of effects of vasodilation or vasoconstriction血管扩张或收缩效应的计算 |
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Blood Flow Examples血液流动示例
Suppose you have an emergency requirement for a five-fold increase in blood volume flowrate (like being chased by a big dog)? How does your body supply it? 假设你突然需要血流量增加五倍（比如被一只大狗追赶）？身体如何满足这种需求？
According to Poiseuille's law, a five-fold increase in blood pressure would be required if the increase were supplied by blood pressure alone! 根据泊肃叶定律，若单纯依靠血压增加，血流将需要五倍的血压提升！
 But the body has a much more potent method for increasing volume flowrate in the vasodilation of the small vessels called arterioles. 但身体在小血管（称为小动脉）的血管扩张中，有更有效的方法来增加体积流量。
 Since the smaller vessels provide most of the resistance to flow, the arterioles in their position just prior to the capillaries can provide a major controlling influence on the volume flowrate. This system of small vessels can constrict flow to one part of the body while enhancing the flow to another to meet changing demands for oxygen and nutrients. 由于较小的血管提供了大部分的阻力，位于毛细血管之前的小动脉在位置上可以对血流量产生重大调控作用。这种小血管系统能够使血液流向身体的一部分而另一部分则增强血流，以满足对氧气和营养物质不断变化的需求。
Calculation of effects of vasodilation or vasoconstriction血管扩张或收缩效应的计算 |
Index Poiseuille's law concepts 索引 埃奥菲定律概念 | ||
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Blood Flow Examples血液流动示例
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Index Poiseuille's law concepts 索引 埃奥菲定律概念 | ||
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