Blood is essential for good health since the body depends on a stable provide of fuel and oxygen to reach its cells. Blood also carries carbon dioxide and some waste materials to the kidneys, lungs and digestive system where they are removed from the body.
We need blood in order to receive nutrients and oxygen from one section of the body to another. Blood has a huge impact on determining specific problems, defects, gestation, in our system. Doctors can determine a lot of diagnosis through blood.
Humans can't live without blood. Without blood, the body's organs couldn't get the oxygen and nutrients they need to survive, we couldn't keep warm or cool off, fight infections, or get rid of our own waste products. Without enough blood, we'd weaken and die.