Liver
The liver is the largest vital organ. A vital organ is one that organisms cannot survive without. It is found in the abdomen of all vertebrates. The liver has many functions, some of which are very complicated. Some of its main functions are to clear toxins from the body and to regulate body metabolism. The liver also filters blood from the digestive system.
In addition, the liver makes some products which the body needs, such as some times of protein and [[Fat > Definition|fat]]s, and it processes and stores many others, such as carbohydrates.
Liver as food
Liver is high in iron and Vitamin A and animal liver is often eaten by human beings. Incidentally, the concept of hypervitaminosis arose from the lethal adverse effects of consuming the liver of polar bear [1] and sled dogs [2].