An average adult human body holds around 10 pints of blood, which accounts for about 7 percent of the body's weight, notes the Rock River Valley Blood Center. Human blood consists of platelets, white blood cells, red blood cells and plasma.
Red blood cell transfusions are not the only use for blood donations. A few other uses for donated blood include bone marrow and organ transplants, replenishing blood lost during surgeries, and aiding burn victims and those in serious vehicle accidents. Even though an adult body holds an average of 10 pints of blood, between 50 and 100 pints of blood could be donated to a single victim involved in a car accident, explains the American Red Cross.