1. The liver regulates most chemical levels in the blood and excretes a product called bile, which helps carry away waste products from the liver. 
2. Production of certain proteins for blood plasma 
3. Production of cholesterol and special proteins to help carry fats through the body 
4. Conversion of excess glucose into glycogen for storage (glycogen can later be converted back to glucose for energy) 
5. Regulation of blood levels of amino acids, which form the building blocks of proteins 
6. Processing of hemoglobin for use of its iron content (the liver stores iron) 
7. Conversion of poisonous ammonia to urea (urea is an end product of protein metabolism and is excreted in the urine) 
8. Clearing the blood of drugs and other poisonous substances 
9. Regulating blood clotting 
10. Resisting infections by producing immune factors and removing bacteria from the bloodstream