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Urine is liquid waste excreted (Excretion is the biological process by which an organism separates waste products from its body....) by the kidney (Either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine; urine passes out of the kidney through ureters to the bladder) and eventually expelled from the body in a process known as urination (The discharge of urine), Most commonly the excretion of urine serves for flushing waste molecules collected from the blood (The fluid (red in vertebrates) that is pumped by the heart) by the kidneys, and for the homeostasis (Metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes) of the body liquids; however, many species also use it for olfactory (Olfaction, the sense of odor| smell, is the detection of chemicals dissolved in air (or, by animals that breathe...) communication (Something that is communicated by or to or between people or groups).
Composition
Urine is a transparent solution that is light yellow to amber in colour, It is the byproduct or waste fluid secreted by the kidneys, transported by the ureters to the urinary bladder where it is stored until it is voided through the urethra, Urine is made up of a watery solution of metabolic wastes (such as urea), dissolved salts and organic materials, Fluid and materials being filtered by the kidneys -destined to become urine- comes from the blood or interstitial fluid (Liquid found between the cells of the body that provides much of the liquid environment of the body)
The composition of urine is adjusted in the process of reabsorption when essential molecules needed by the body, such as glucose, are reabsorbed back into the blood stream via carrier molecules, The remaining fluid contains high concentrations of urea and other excess or potentially toxic substances that will be released from the body via urination, Urine flows through the following structures: the kidney, ureter (Either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder)
Bladder (A distensible membranous sac (usually containing liquid or gas)), and finally the urethra (Duct through which urine is discharged in most mammals and which serves as the male genital duct), Urine is produced by a process of filtration (The act of changing a fluid by passing it through a filter)
Urine contains large amounts of urea (The chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics), an excellent source of nitrogen (A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues) for plants, As such it is a useful accelerator for compost (A mixture of decaying vegetation and manure; used as a fertilizer)