Heart Blood Pressure Problem

[chancemeplis]

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I'm looking at this question about pressure through the various vessels in the circulatory system: http://goo.gl/x3HvTz

The explanation they give isn't really helpful. Why is there a difference in pressure and why that trend?

 

[Schenker]

In order for fluid to flow from point A to point B, the pressure at A has to be greater than the pressure at B.

We know that blood moves from

arteries to arterioles to capillaries to venules to veins, so the pressures have to decrease in this order:
arteries > arterioles > capillaries > venules > veins.