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Mathematics 11 Online
OpenStudy (anonymous):

Describe the mechanisms that arteries and veins use to keep blood flowing in the proper direction, even when the artery or vein is located far from the heart.

imqwerty (imqwerty):

check this out- https://answers.yahoo.com/question/index?qid=20150304053607AAUJ7uk

OpenStudy (anonymous):

i saw dat but thx

imqwerty (imqwerty):

cool :3

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