Question

Write notes on ureotelism.

Answer 1

A ureotelic organism excretes excess nitrogen as urea. It is one of the three major forms of excretion of nitrogenous waste in organisms, the others being ammonotelism and uricotelism. Urea is less toxic than the ammonia excreted by ammonotelic organisms. It requires 0.05 L of water to excrete 1 g of nitrogen, approximately only 10% of that required in ammonotelic organisms. Ureotelic organisms include cartilaginous fish, some bony fish, adult amphibians, and mammals, among others. Humans can be described as being ureotelic organisms.


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Answer 2

The process of elimination of urea from an organism is called ureotelism. The ureotelic organisms excrete in the form of less toxic nitrogenous waste such as urea.

The secretion occurs through kidneys, body and lungs.

Terrestrial organisms secrete in the form of nitrogenous waste because of lack of availability of water.

The urea is synthesized from the more toxic ammonia in the liver. This process of conversion of ammonia to urea is called ornithine-urea cycle.

The process was first explained by Kreb and Hansleit in 1932.