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| Blood_Vessels (Photo credit: shoebappa) |
The answer is quite simple: because most of the blood vessels are thinner than a hair's breadth! The largest blood vessels in our body are the arteries and the veins. These are like the great superhighways of the body. But there are also millions of tiny capilIarieswhich are the tiny roads, paths, and trails of the blood system, unmarked on mostmaps, and, in the body, invisible except through a microscope.
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