Find more facts and information on our topic page about
excretion
excretion
excretion The elimination by an organism of the waste products that arise as a result of metabolic activity. These products include water, carbon dioxide, and nitrogenous compounds. Excretion plays an important role in maintaining the constancy of an organism's
internal environment (see
homeostasis). The simplest method of excretion, which occurs, for example, in plants, involves diffusion of waste products from the body, but many animals have specialized organs and organ systems devoted to this function (see
Malpighian tubule;
nephridium). Examples of excretory organs in vertebrates are the lungs (for carbon dioxide and water), and the
kidneys (for
nitrogenous waste and water). In addition, mammals excrete small amounts of urea, salts, and water from the skin in sweat.
Cite this article
Pick a style below, and copy the text for your bibliography.
|
Urinary excretion of folate catabolites responds to changes in folate intake more slowly than plasma folate and homocysteine concentrations and lymphocyte DNA...
Magazine article from: The Journal of Nutrition; 12/1/2000; ; 700+ words
; Urinary Excretion of Folate Catabolites Responds to Changes in Folate Intake More...accepted 31 August 2000.) ABSTRACT Folate turnover involves urinary excretion, fecal excretion, and catabolism that involves cleavage of the C9-NIO bond to...
|
|
Urine Mercury Excretion Following meso-Dimercaptosuccinic Acid Challenge in Fish Eaters
Magazine article from: Archives of Pathology & Laboratory Medicine; 1/1/2009; ; 700+ words
; ...on urine mercury excretions following oral...comparing urine mercury excretion following DMSA...and creatinine excretions were measured before...urinary mercury excretion was detected between...urinary mercury excretions were measured in...urinary mercury excretion after chelation...
|
|
Diminished Urinary Free Cortisol Excretion in Patients with Moderate and Severe Renal Impairment
Magazine article from: Clinical Chemistry; 4/1/2004; ; 700+ words
; ...role. The 24-h urinary free cortisol excretion is widely used because of its relatively...reliability of using 24-h urinary cortisol excretion for the diagnosis of Cushing syndrome implies that urinary excretion of cortisol is relatively unaffected...
|
|
Prediction of urinary excretion of technetium-99m-MAG3
Magazine article from: The Journal of Nuclear Medicine; 7/1/1998; ; 700+ words
; The urinary excretion of 9Tc-mercaptotriacetylglycine (MAG3), like that of...parameter is often quantitated as the excretory index (observed excretion/predicted excretion). A new method for predicting the urinary excretion of 99mTc...
|
|
Evaluation of urinary nitrogen excretion from plasma urea nitrogen in dry and lactating cows.(Report)
Magazine article from: Asian - Australasian Journal of Animal Sciences; 8/1/2008; ; 700+ words
; ...predicting urinary nitrogen (N) excretion from plasma urea nitrogen (PUN...equations of N intake on urinary N excretion varied in dry and lactating cows, and the difference of urinary N excretion between dry and lactating cows was...
|
|
Prediction of Manure and Nutrient Excretion from Dairy Cattle
Magazine article from: Journal of Dairy Science; 10/1/2005; ; 700+ words
; ...ABSTRACT Accurate estimates of manure excretion are needed for planning manure storage...universities were compiled and evaluated for excretion of total manure, N, P, and K. Animal...Regression equations were developed to predict excretion of total manure, total dry matter...
|
|
|
Supplementary Concentrate Type Affects Nitrogen Excretion of Grazing Dairy Cows
Magazine article from: Journal of Dairy Science; 10/1/2004; ; 700+ words
; ...investigate nutritional means of reducing urine N excretion by grazing cows. In experiment 1, 36 Holstein...concentrate had the highest levels of N intake, total N excretion, and urine N excretion. The proportion of N excreted in the urine was...
|
|
|
Urinary excretion of endogenous nitrogen metabolites in adult domestic cats using a protein-free diet and the regression technique
Magazine article from: The Journal of Nutrition; 4/1/1997; ; 700+ words
; ...urinary nitrogen metabolite excretions of adult cats fed four levels...urea and ammonia nitrogen excretions for the cats fed the protein...statistically significant. Daily excretions of creatinine nitrogen were...urinary total and urea nitrogen excretion of adult domestic cats is...
|
|
|
Evaluation of Solids, Nitrogen, and Phosphorus Excretion Models for Lactating Dairy Cows
Magazine article from: Journal of Dairy Science; 3/1/2008; ; 700+ words
; ...and to compare results with published excretion models. The project was conducted at...slurry and flushwater. Nitrogen and P excretion were also calculated from dietary inputs...DM (remainder after drying at 60C) excretion of 8.02 to 8.53 kg/d per cow...
|
|
|
Prediction and Evaluation of Urine and Urinary Nitrogen and Mineral Excretion from Dairy Cattle
Magazine article from: Journal of Dairy Science; 1/1/2006; ; 700+ words
; ABSTRACT Urine excretion is a substantial factor in the amount...decrease urine and urinary nutrient excretion will provide information for managing...develop equations for prediction of urine excretion and excretion of urinary N, Na, and...
|
|
excretion
Book article from: The Oxford Companion to the Body
excretion is the transfer of substances out of...animal body there is also another type of excretion: expulsion of the residue of substances...and faeces , whereas the definition of excretion would also include both carbon dioxide...
|
|
Nutrient–Drug Interactions
Encyclopedia entry from: Encyclopedia of Food and Culture
...metabolism, action, retention, and/or excretion of a drug, or conversely the process...metabolism, action, retention, and/or excretion of a nutrient. Adverse consequences...transformation (biotransformation), and excretion. Interactions affecting pharmacokinetics...
|
|
Excretory System
Encyclopedia entry from: The Gale Encyclopedia of Science
...organism. In providing these functions, excretion contributes to the body ’ s...from the body. This method of ammonia excretion is particularly advantageous for these...organelle, the contractile vacuole, aids in excretion by expelling excess water and some nitrogenous...
|
|
|
calcium
Book article from: The Oxford Companion to the Body
...the absorption rate into blood, and excretion rate in the urine) is only about one...absorption from the small intestine and excretion from the kidneys are also regulated to...In the kidneys it both reduces calcium excretion and promotes formation of the active...
|
|
Osmoregulation
Book article from: Biology
...unavoidably lose water by evaporation and excretion, and replacement water is not always...hormones that control the rate of sodium excretion or the water permeability of the excretory...urination is a mechanism of both waste excretion and osmoregulation. Organelles and organs...
|
