In what form nitrogen is excreted by animal?

Animals excrete a variety of nitrogen waste products, but ammonia, urea and uric acid predominate. A major factor in determining the mode of nitrogen excretion is the availability of water in the environment.

What animals secrete ammonia?

Birds, reptiles, and most terrestrial arthropods convert toxic ammonia to uric acid or the closely related compound guanine (guano) instead of urea. Mammals also form some uric acid during breakdown of nucleic acids.

How is urea produced in animals?

Urea is made in the liver and excreted in urine. The overall chemical reaction by which ammonia is converted to urea is 2 NH3 (ammonia) + CO2 + 3 ATP + H2O → H2N-CO-NH2 (urea) + 2 ADP + 4 Pi + AMP. The urea cycle utilizes five intermediate steps, catalyzed by five different enzymes, to convert ammonia to urea.

How do animals excrete nitrogen?

Terrestrial organisms have evolved other mechanisms to excrete nitrogenous wastes. The animals must detoxify ammonia by converting it into a relatively nontoxic form such as urea or uric acid. Mammals, including humans, produce urea, whereas reptiles and many terrestrial invertebrates produce uric acid.

How is nitrogen excreted from body?

Nitrogen excretion: Nitrogenous waste is excreted in different forms by different species. These include (a) ammonia, (b) urea, and (c) uric acid. In this case, uric acid is excreted in urine instead of in feces, as is done in birds and reptiles. Uric acid is a compound similar to purines found in nucleic acids.

How much ammonia is in cow urine?

Ammonia concentration of 11.7 to 58.7 mmol per litre of urine is considered as a tolerable limit.

What animal excretes urea?

Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste.

What organ of the body makes urea?

The liver produces several chemicals (enzymes) that change ammonia into a form called urea, which the body can remove in the urine.

Which animal does not excrete?

Examples of some ureotelic organisms are cartilaginous fish, few bony fishes, adult amphibians and mammals including humans. The ureotelic animals lack urease enzyme, the enzyme which breaks urea into ammonia and carbon dioxide.