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Amov
Forum Newbie Topics: 3 Posts: 6 |
Why does arterioles are consider of high resistance if arterioles are arrange in a parallel resistance system?
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djroac01
| Forum Newbie Topics: 2 Posts: 12
Remember, velocity is inversely proportional to cross-sectional area. Arterioles are extensive vessels with many, many branches. The net result of this extensive branching is a very large cross-sectional area. This large cross-sectional area results in a slower velocity. The net result of the large cross-sectional area resulting in slow velocity is: 1) the cross-sectional area provides a large surface area for nutrient/gas exchange 2) the slow blood velocity in the arterioles allow time for nutrient/gas exchange. There is a pretty good picture on this website if you scroll down the page a ways: www.rci.rutgers.edu/~uzwiak...natPhys/Blood_Vessels.html
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eileeney
| Forum Newbie Topics: 0 Posts: 1
 Does it mean like extensive branching of arterioles lead to increased resistance, increasing surface area? I don't really get this. capillaries have largest suface area.
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Drhouse127
| Forum Newbie  Topics: 2 Posts: 37
the difference of radius from arteries to arterioles is greater(from 450μm down to 100μm) than the difference between arterioles and capillaries.(4μm).thats why most of the pressure drop occurs in the arterioles.
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