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Blood flow from point a to b

why does blood flow from point a to b ?
Asked On : Tue, 15 Dec 2009
Answers:  1 Views:  436
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  User's Response
Everybody's answer above is correct. They only neglected to mention that the reason the blood does not flow backward is, the veins have one-way valves. When the heart contracts the valves in the veins open and the blood flows forward. When the heart expands to receive more blood, the valves in the veins close so that the blood does not flow back from the way it came.
Answered: Tue, 15 Dec 2009
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