Individuals who want to donate whole blood or apheresis must be : At least 16 years old (donors under the age of 17 may only donate whole blood, and must have a signed parental/guardian consent form). At least 19 years old and weigh a minimum of 110 pounds.
Your heart handles blood in much the same way. The heart pumps about 2,000 gallons (7,571 liters) of blood a day through its chambers. Of Â­course, we're not big enough to hold that much liquid, so it just pumps the same blood over and over, and it doesn't benefit from a drop of it. At least, not initially.
Over 1,500 Gallons of Blood Pumped Daily. The heart is a powerful muscle that beats without stopping throughout a lifetime. It pumps about 55-80 ml (1/3 cup) of blood with each beat for adults and around 25-85 ml per beat for children. An adult heart pumps about 6,000-7,500 liters (1,500-2,000 gallons) of blood daily. The average adult body contains about five quarts of blood which continually circulates throughout the body. The shortest trip to the heart muscles takes only a few seconds. The trip to the toes takes over a minute.