Posted by TOM on Tuesday, February 2, 2010 at 6:50pm.
First of all, think about the difference in the blood flowing between an artery and a vein. Then try here:
http://www.google.com/search?q=why+arteries+have+mor+muscle+in+their+walls+than+veins&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Sra
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