Protected by ribs, filling the upper right part of abdomen, the liver is the largest gland in the body, weighting 1.35 Kg. and producing over 1000 different enzymes to handle chemical conversions for more than 500 jobs. This complex and vital organ is intimately concerned with metabolism of carbohydrates, proteins and fats with the regulation of blood sugar and the storage of glycogen and factors essential for the formation of red blood cells. It synthesizes prothrombrin, heparin (which retards clotting of blood), and the proteins of the body, renders many toxic substances ineffective by chemical treatment. Liver secrets bile, important in the digestion of fats. Obstruction o the flow of bile into the gut can pile up pigments, bilirubin and biliverdin and spill them over into the bloodstream to produce jaundice. As much as 80 percent of the liver tissue can be cut away as in cancer surgery, and still the liver functions normally, it can rebuild in a few months, back to the normal size.