the.com/circulation
your blood runs a 60,000-mile loop daily and never once asks for a break
total lengthvessels span roughly 60,000 miles, twice Earth's circumference
daily volumeheart pumps about 2,000 gallons every day
discoveryWilliam Harvey proved the loop in 1628
full lapa blood cell circles your body in under a minute
capillary widthsome are narrower than a single red cell