What substances do liver produce?

Answer 1

The various functions of the liver are carried out by the liver cells or hepatocytes. Currently, there is no artificial organ or device capable of emulating all the functions of the liver. Some functions can be emulated by liver dialysis, an experimental treatment for liver failure. The liver is thought to be responsible for up to 500 separate functions, usually in combination with other systems and organs.

Synthesis

Further information: Proteins produced and secreted by the liver

A CT scan in which the liver and portal vein are shown.

A large part of amino acid synthesis

The liver performs several roles in carbohydrate metabolism:

Gluconeogenesis (the synthesis of glucose from certain amino acids, lactate or glycerol)

Glycogenolysis (the breakdown of glycogen into glucose)

Glycogenesis (the formation of glycogen from glucose)(muscle tissues can also do this)

The liver is responsible for the mainstay of protein metabolism, synthesis as well as degradation.

The liver also performs several roles in lipid metabolism:

Cholesterol synthesis

Lipogenesis, the production of triglycerides (fats).

A bulk of the lipoproteins are synthesized in the liver.

The liver produces coagulation factors I (fibrinogen), II (prothrombin), V, VII, IX, X and XI, as well as protein C, protein S and antithrombin.

In the first trimester fetus, the liver is the main site of red blood cell production. By the 32nd week of gestation, the bone marrow has almost completely taken over that task.

The liver produces and excretes bile (a yellowish liquid) required for emulsifying fats. Some of the bile drains directly into the duodenum, and some is stored in the gallbladder.

The liver also produces insulin-like growth factor 1 (IGF-1), a polypeptide protein hormone that plays an important role in childhood growth and continues to have anabolic effects in adults.

The liver is a major site of thrombopoietin production. Thrombopoietin is a glycoprotein hormone that regulates the production of platelets by the bone marrow.

Breakdown

The breakdown of insulin and other hormones

The liver glucoronidates bilirubin, facilitating its excretion into bile.

The liver breaks down or modifies toxic substances (e.g., methylation) and most medicinal products in a process called drug metabolism. This sometimes results in toxication, when the metabolite is more toxic than its precursor. Preferably, the toxins are conjugated to avail excretion in bile or urine.

The liver converts ammonia to urea (urea cycle).

Other functions

The liver stores a multitude of substances, including glucose (in the form of glycogen), vitamin A (1-2 years' supply), vitamin D (1-4 months' supply), vitamin B12 (1-3 years' supply), iron, and copper.

The liver is responsible for immunological effects-the reticuloendothelial system of the liver contains many immunologically active cells, acting as a 'sieve' for antigens carried to it via the portal system.

The liver produces albumin, the major osmolar component of blood serum.

The liver synthesizes angiotensinogen, a hormone that is responsible for raising the blood pressure when activated by renin, an enzyme that is released when the kidney senses low blood pressure.

Answer 2

the liver produces glycogen and urea which is the main substance of urine