urea cycle

a series of metabolic reactions, occurring in the liver, by which ammonia is converted to urea using cyclically regenerated ornithine as a carrier. See illustration.

Urea cycle. Diagrammatic representation of reactions by which excess nitrogen in the form of ammonia is converted to soluble urea, using L-ornithine as a recyclable carrier. Enzymes involved are denoted by circled numerals: (1), carbamoyl-phosphate synthase (ammonia); (2), ornithine carbamoyltransferase; (3), argininosuccinate synthase; (4), argininosuccinate lyase; (5), arginase.


Medical dictionary. 2011.

Look at other dictionaries:

  • Urea cycle — The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions occurring in many animals that produces urea ((NH2)2CO) from ammonia (NH3). This cycle was the first metabolic cycle discovered (Hans Krebs and Kurt Henseleit …   Wikipedia

  • urea cycle — Biochem. a metabolic process by which ammonia derived from amino acids is converted into urea in the liver. Also called Krebs urea cycle. * * * …   Universalium

  • urea cycle — Biochem. a metabolic process by which ammonia derived from amino acids is converted into urea in the liver. Also called Krebs urea cycle …   Useful english dictionary

  • urea cycle — /juˈriə saɪkəl/ (say yooh reeuh suykuhl) noun a series of reactions in animals involving the conversion of ammonia, carbon dioxide and aspartic acid to urea and fumaric acid, for the excretion of urea and the production of arginine …   Australian English dictionary

  • Urea cycle disorder — Infobox Disease Name = PAGENAME Caption = ammonia DiseasesDB = ICD10 = ICD10|E|72|2|e|70 ICD9 = ICD9|270.6 ICDO = OMIM = MedlinePlus = 000372 eMedicineSubj = eMedicineTopic = MeshID = An urea cycle disorder or urea cycle defect is a genetic… …   Wikipedia

  • Krebs urea cycle. — See urea cycle. [after H.A. KREBS] * * * …   Universalium

  • Krebs urea cycle. — See urea cycle. [after H.A. KREBS] …   Useful english dictionary

  • Urea — Urea …   Wikipedia

  • Cycle De L'urée — Le cycle de l urée ou cycle de l ornithine est un cycle de réactions biochimiques chez divers animaux qui produisent de l urée à partir de l ammoniaque. Il s agit du premier cycle métabolique identifié dès 1932 par Krebs et Hensenleit. Ce cycle… …   Wikipédia en Français

  • Cycle de l'ornithine — Cycle de l urée Le cycle de l urée ou cycle de l ornithine est un cycle de réactions biochimiques chez divers animaux qui produisent de l urée à partir de l ammoniaque. Il s agit du premier cycle métabolique identifié dès 1932 par Krebs et… …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.