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What Is Ureotelism?

The elimination of urea in an organism is called ureotelysm, and animals that excrete their residue mainly in various forms of nitrogen such as urea are called ureotelyses.


Excretion in our body occurs through the skin, kidneys and lungs. They release toxic substances. Carbon dioxide is released from the lungs, the kidneys remove excess water, salt and urea, and the skin removes salt and water from our bodies.

Urea is a colorless, naturally crystalline compound obtained as a nitrogenous compound by the digestion of proteins. It is formed when protein synthesizes amino acids after digestion.

These excess amino acids are broken down by the liver through the urea cycle into ammonia, and then into urea, because ammonia is more toxic than urea.

Chemically, urea is made up of nitrogen, oxygen and carbon and is normally found in our body in blood, sweat and urine. Urea contains more nitrogen than any other element.

The urea cycle begins with deamination in the liver where amino acids are broken down into ammonia. Ammonia is a poisonous substance, and its accumulation in the body can be fatal. Molecules and enzymes in the liver convert this toxic ammonia into urea.

This reaction consumes one molecule of carbon dioxide and two molecules of ammonia to form urea and one ornithine to continue the reaction Excretory products in humans include glucose, water, salt and urea.

It is produced by the kidneys by hemolysis at high pressure. Blood reabsorbs water, salts and glucose but not urea. It is urine that is removed from the body as water. Disorders of the urea cycle can affect the liver’s ability to detoxify ammonia.

The Ornithine-Urea Cycle

Ammonia detoxification consumes three molecules of ATP. This reaction, called the ornithine-urea reaction, was discovered in 1932 by Crabb and Henslett. The 5 reactions are chemical reactions catalyzed by enzymes.

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