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Image: Information: In our bodies there is approximately 4.7- 5.5 litres of blood (for an average adult), a child who is of average build and weighs 80 pounds (36kg) will have about half the amount of an adult. So between 2.35-2.75 litres of blood. For an average sized human of an average weight and health, and resting heart rate. It would take around about 1 minute for their blood to go all around their body. Not all blood has to travel the same distance though. Generally blood travels at around 3 feet per second. Factors that can affect the above calculation can be: their height, weight, body proportions, type of exercise and blood pressure. So each individual is different. Facts: Adults have around 4.7-5.5 litres of blood in their body A child (36kg) has around 2.352.75 litres of blood in their body Blood travels at 3 feet per second, but slows down as it gets into smaller arteries and capillaries It takes about 1 minute for your blood to go around your body, even faster if you are running Oxygen and nutrients travel in our blood Your heart beats about 35 million times in a year, over 2.5 billion times in your lifetime If you spread out all your blood vessels they would stretch 2 and a half times around the world (approximately 100,000km) Even though your skins thickness is 2mm, it gets an 8th of all your blood supply Red blood cells can live up to four months circulating around the circulatory system