How can blood pressure be lower in the aterioles compared to arteries when its the high hydrostatic pressure that causes the formation of tissue fluid?

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In my text book, it says that there is a lower blood pressure in arterioles so the overall thickeness of the wall is smaller than in arteries.So what is it that causes this lower blood pressure in veins and arterioles?

However, when it talks about the formation of tissue fluid, it says that blood flowing from the arteries, to the artelories to the capillaries increasing hydrostatic pressure as they get narrower, so surely them becoming narrower would increase blood pressure as blood moves away from the heart, not decrease it?!

someone please help I have an exam on monday!

Posted Sat 19th May, 2012 @ 13:10 by claire hopkins

1 Answer

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Answered Sat 19th May, 2012 @ 18:00 by LP-FTW