Each 2.54 square centimetre (a square inch) of human skin has six metres (20ft) of blood vessels. Veins hold about 65 per cent of the body's blood and have one-way valves tohelp blood move.

All values must be entered in order to calculate percentiles for Blood Pressure and Height. A percentile shows the relative position of the child's measurement (such as Blood Pressure or Height) among ...

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 ...