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smn smn
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11 years ago
Why is there resistance, is it tendons?

Sheep heart not a Human heart Slight Smile
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wrote...
11 years ago
arteries are made of smooth muscle and elastic cells = resistance
wrote...
11 years ago
Well, I'd imagine the owner of the artery would probably try to put a stop to it...

However, I'm guessing you're talking about the valves.  There are one-way valves in many blood vessels that prevent blood from moving in the wrong direction.
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