I am Aboriginal Blood is a liquid connective tissue whose main job is transportation of nutrients and wastes. An analogy would be streets and highways with the roads being the blood vessels and the cars, trucks, and motorcycles being the blood. In this model, the driveways would be the capillaries and the houses and buildings would be the cells in the body. It is very important for a human. To know more click this link [link| Ifrard blood Circulation Massager