The liver has many important metabolic functions.
Liver tissue is made up of lots of smaller units of liver cells called lobules. Many canals carrying blood and bile run between the liver cells. Blood coming from the digestive organs flows through the portal vein to the liver, carrying nutrients, medication and also toxic substances. Once they reach the liver, these substances are processed, stored, altered, detoxified, and passed back into the blood or released in the bowel to be eliminated. In this way the liver can, for example, remove alcohol from your blood and get rid of by-products from the breakdown of medications.
With the help of vitamin K, the liver produces proteins that are important in blood clotting. It is also one of the organs that break down old or damaged blood cells.
Some of the more well-known functions include the following:
- Production of bile, which helps carry away waste and break down fats in the small intestine during digestion
- Production of certain proteins for blood plasma
- Production of cholesterol and special proteins to help carry fats through the body
- Conversion of excess glucose into glycogen for storage. (This glycogen can later be converted back to glucose for energy.) It converts the nutrients in our diets into substances that the body can use, stores these substances, and supplies cells with them when needed.
- It converts the nutrients in our diets into substances that the body can use, stores these substances, and supplies cells with them when needed.
- Balancing and production of glucose as needed.
- Regulation of blood levels of amino acids, which form the building blocks of proteins
- Processing of hemoglobin for distribution of its iron content. (The liver stores iron.)
- Conversion of poisonous ammonia to urea. (Urea is one of the end products of protein metabolism that is excreted in the urine.)
- It also takes up toxic substances and converts them into harmless substances or makes sure they are released from the body.
- Clearing the blood of drugs and other toxic substances
- Regulating blood clotting
- Resisting infections by producing immune factors and removing certain bacteria from the bloodstream
- Clearance of bilirubin. An accumulation of bilirubin will turn the skin and eyes yellow.
- In fat metabolism the liver cells break down fats and produce energy. They also produce about 800 to 1,000 ml of bile per day. This yellow, brownish or olive green liquid is collected in small ducts and then passed on to the main bile duct, which carries the bile to a part of the small intestine called the duodenum. Bile is important for the breakdown and absorption of fats.
- In the metabolism of carbohydrates, the liver helps to ensure that the level of sugar in your blood (blood glucose) stays constant. If your blood sugar levels increase, for example after a meal, the liver removes sugar from blood supplied by the portal vein and stores it in the form of glycogen. If someone’s blood sugar levels are too low, the liver breaks down glycogen and releases sugar into the blood. As well as sugar, the liver also stores vitamins and minerals (iron and copper), and releases them into the blood when needed.
- The liver also plays an important role in the metabolism of proteins: liver cells change amino acids in foods so that they can be used to produce energy, or make carbohydrates or fats. A toxic substance called ammonia is a by-product of this process. The liver cells convert ammonia to a much less toxic substance called urea, which is released into the blood. Urea is then transported to the kidneys and passes out of the body in urine.