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Main pageHealth A-ZAnatomy → Urinary system
24.06.2014
Text prepared: Irina Kiriyenko
Urinary system

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Definition

Function

Right Doctor to Treat

 

 

 

Definition

The urinary system, also known as the renal system, consists of the two kidneys, ureters, the bladder, and the urethra. Each kidney consists of millions of functional units called nephrons. The purpose of the renal system is to eliminate wastes from the body, regulate blood volume and pressure, control levels of electrolytes and metabolites, and regulate blood pH. The kidneys have extensive blood supply via the renal arteries which leave the kidneys via the renal vein. Following filtration of blood and further processing, wastes (in the form of urine) exit the kidney via the ureters, tubes made of smooth muscle fibers that propel urine towards the urinary bladder, where it is stored and subsequently expelled from the body by urination (voiding). The female and male urinary system are very similar, differing only in the length of the urethra.

 

Function

There are several functions of the urinary system:

  • Removal of waste product from the body (mainly urea and uric acid)

  • Regulation of electrolyte balance (e.g. sodium, potassium and calcium)

  • Regulation of acid-base homeostasis

  • Controlling blood volume and maintaining blood pressure

 

Right Doctor to Treat

Urologist

Gynecologist

Nephrology

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