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.

Blood pressure (BP) is a measure of the force of blood on the blood vessel walls. Blood vessels can widen or constrict their diameter in order to control blood pressure. Normal range for blood ...

Video Back Videos home Signature collection Essentials collection Artificial Intelligence ...

In early fetal development, it forms from two smaller blood vessels, called the dorsal aortae, that join together. As it moves downward, the abdominal aorta splits into three main branches: the renal ...

Video Back Videos home Signature collection Essentials collection Artificial Intelligence ...