When laid out back-to-back in a single line, the blood vessels of one human being are long enough to wrap around the world more than two times, according to The Franklin Institute. This equals a length of 60,000 to 100,000 miles long, depending on the individual.
Although children are smaller, the vessels from their circulatory system are still long enough to wrap around the world more than two times, says The Franklin Institute. The vessels of adults can wrap around the world more than two and a half times. There are three types of blood vessels, including arteries, veins and capillaries.