Skip to main content
Select Source:

urea cycle

urea cycle (ornithine cycle) The series of biochemical reactions that converts ammonia, which is highly toxic, and carbon dioxide to the much less toxic urea during the excretion of metabolic nitrogen derived from the deamination of excess amino acids. These reactions take place in the liver in mammals and, to a lesser extent, in some other animals. The urea is ultimately excreted in solution in urine.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"urea cycle." A Dictionary of Biology. . Encyclopedia.com. 23 Jul. 2017 <http://www.encyclopedia.com>.

"urea cycle." A Dictionary of Biology. . Encyclopedia.com. (July 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/urea-cycle-0

"urea cycle." A Dictionary of Biology. . Retrieved July 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/urea-cycle-0

urea cycle

urea cycle (ornithine cycle) A cyclic series of reactions by which carbon dioxide and ammonia, the latter derived from amino groups from amino-acid catabolism, are converted to urea prior to excretion.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"urea cycle." A Dictionary of Zoology. . Encyclopedia.com. 23 Jul. 2017 <http://www.encyclopedia.com>.

"urea cycle." A Dictionary of Zoology. . Encyclopedia.com. (July 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/urea-cycle

"urea cycle." A Dictionary of Zoology. . Retrieved July 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/urea-cycle

ornithine cycle

ornithine cycle See urea cycle.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"ornithine cycle." A Dictionary of Biology. . Encyclopedia.com. 23 Jul. 2017 <http://www.encyclopedia.com>.

"ornithine cycle." A Dictionary of Biology. . Encyclopedia.com. (July 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ornithine-cycle-0

"ornithine cycle." A Dictionary of Biology. . Retrieved July 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ornithine-cycle-0

ornithine cycle

ornithine cycle See UREA CYCLE.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"ornithine cycle." A Dictionary of Zoology. . Encyclopedia.com. 23 Jul. 2017 <http://www.encyclopedia.com>.

"ornithine cycle." A Dictionary of Zoology. . Encyclopedia.com. (July 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ornithine-cycle

"ornithine cycle." A Dictionary of Zoology. . Retrieved July 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ornithine-cycle