What element is found in liver and is needed to prevent anemia or "tired" blood..

The element which is found in liver and it is needed to prevent anemia is called iron (Fe).
 In the body iron is very important reason being that it is needed to make hemoglobin which carries oxygen to all over the body. When there is the deficiency of iron in the body, then it means that the body is not getting enough oxygen.
For someone to prevent anemia should eat foods which are rich in iron or can use the supplement which is being recommended by a physician. For example B-12. To women, because they lose a lot of blood during menstruation are recommended to take a lot of vegetables.
Blood from the liver exits through the hepatic vein to the heart. Hepatic artery is well known for delivering oxygenated blood from the general circulation and portal vein which is from the small intestine.