Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly ... six metres (20ft) of blood vessels.

it would go all the way around the world…twice! Of course, you could only drive on it in a very very very small car. Blood vessels are a series of tubes inside your body. They move blood to and ...

The heart is a pump, and the blood goes round, and round, and round all the time. And why does it do that? Why can't it just have a rest? Well, the blood has to be kept moving around all the time ...