The reason a blood vessel can stretch has to do with how it's designed. Cut a blood vessel in half and look at its cross section, and you'll see there's a thin lining on the outside. The clear sheet on the inside, that is a special layer. That layer is slippery. It's like the surface of an ice skating rink that's been polished and buffed before the first skaters get on it. We eat a diet not so good for our circulation.

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