Urinary system
anatomical system
The urinary system, also known as the urinary tract or renal system, is a part of the excretory system of vertebrates. In humans and placental mammals, it consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate urine from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH. The kidneys have an extensive blood supply via the renal arteries which leave the kidneys via the renal vein. Each kidney consists of functional units called nephrons. Following filtration of blood and further processing, the ureters transport urine from the kidneys into the urinary bladder. The female and male urinary system are very similar, differing only in the length of the urethra, which transports urine from the bladder through the penis or vulva during urination.
Healthy humans normally produce 800–2,000 milliliters (mL) of urine every day. This amount varies according to fluid intake and kidney function.
Structure
The urinary system refers to the structures that produce and excrete urine. In the human urinary system there are two kidneys that are located between the dorsal body wall and parietal peritoneum on both the left and right sides.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Mar 17, 2026. The linked authority identifier is Q181100. The Library of Congress control number is sh85141406. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “Urinary system” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.