The exact number of arteries and veins in the human body is not specified in my sources. However, if you were to lay out all of the arteries, capillaries and veins in one adult, end-to-end, they would stretch about 60,000 miles (100,000 kilometers) 1. What’s more, the capillaries, which are the smallest of the blood vessels, would make up about 80 percent of this length
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