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Urinary system
Latin systema urinarium

The urinary system (also called excretory system or the genitourinary system) is the organ system that produces, stores, and eliminates urine. In humans it includes two kidneys, two ureters, the bladder, the urethra, and the penis in males. The analogous organ in invertebrates is the nephridium.

Contents

[edit] Physiology

[edit] Kidney

The kidneys are bean-shaped organs, which lie against the posterior part of the abdominal wall, retroperitoneal to the organs.

[edit] Urethra

The endpoint of the urinary system is the urethra. Typically the urethra in humans is colonised by commensal bacteria below the external urethral sphincter. The urethra emerges from the end of the penis in males and between the clitoris and the vagina in females.

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