The vessels through which blood flows are called blood vessels.
They are a critical tissue for biological function, including transporting oxygen and nutrients, breaking down waste products and carbon dioxide, and controlling body temperature.
The 60 trillion cells that make up the human body are maintained by the blood arteries that are dispersed throughout our bodies.
They are estimated to weigh about as much as a human liver and span a total distance of 100,000 kilometers, or two and a half times around the globe.
They also have a surface area of 3,000 square meters or six tennis courts.