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 four times. Each 2.54 square centimetre (a square inch ...

Each square inch of human skin consists of 6m (20ft) of blood vessels. Veins hold about 65 pc of the body's blood and have one-way valves to help blood move. Capillaries, which carry blood to our ...

There are three types of blood vessel: arteries, veins and capillaries. The heart is a muscular organ that pumps blood around your circulatory system. The circulatory system is the heart and all ...