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The discharge of urine from the bladder. Also known as micturition.



(also called micturition), the reflex act of excreting urine from the body.

Uropoiesis—the production of urine—is a constant process, but urination occurs only intermittently, as the urinary bladder fills. Humans urinate four to six times daily. Urine is prevented from escaping from the bladder by two ring-shaped layers of muscle fibers: an internal sphincter, which consists of smooth muscle fibers, and an external one, which consists of striated fibers. When the pressure within the bladder reaches 2–2.66 kN/m2 (kilonewtons per square meter), or 15–20 mm Hg (millimeters of mercury), stimulation of the mechanoreceptors (the nerve endings of sensory neurons) in the wall of the bladder elicits the urge to urinate. In man, this critical pressure is achieved when 300–350 ml of urine accumulate in the bladder. During urination, the external sphincter relaxes reflexively as the muscles of the bladder wall contract.

Urination is regulated by the nerve centers in the spinal cord and brain; these centers are controlled, in turn, by the cerebral cortex. The filling of the urinary bladder arouses the cerebral cortex to elicit the urge to urinate. Certain neurological diseases, as well as injuries to the muscles of the urinary bladder, impair urination.


What does it mean when you dream about urination?

Urination in a dream has several interpretations that range from inhibited sexual desires to the outpouring of emotional feelings that have been repressed.


Releasing bodily wastes in a dream suggests a need to release repressed emotions and/or anxiety. At times, urination may have sexual connotations. Many people dream about the need to urinate, which wakes them up, and then they realize that they need to use the bathroom. At times, the dream triggers the physical sensation and other times the physical sensation may become a part of the dream.
References in periodicals archive ?
Yesterday, a picture of State Health Minister urinating had gone viral.
The signs will be set up in places Asians mostly gather and other locations where urinating is a habit.
In December 2013, another person was found urinating on war memorial at Church Street in Llantwit Major.
Prosecutors said that Lewis Edwards, 20, of Feltwood Grove, West Derby and Ryan Walsh, 18, of Mayville Road, Mossley Hill attacked David Goggin when he remonstrated with them about urinating on the cenotaph in Lord Street.
Total excision is preferred because the mass can be large enough to make urinating difficult; there is also a small chance of malignancy.
I heard footsteps towards my bedroom, then heard someone urinating in the bathroom.
Walking the streets of Sana'a, your eyes are in constant motion as they dart from one scene of commotion to another,but people are complaining there is one sight that no one wants to see -- someone urinating on the street.
WASHINGTON: Al-Qaeda leader Ayman Al-Zawahri urged Afghans in audio message Wednesday to rise up against "Crusader pigs" after US Marines were shown in an internet video urinating on the corpses of Taliban militants.
RE Graham Green's letter (Jan 28) about dogs urinating on a grassed area in his road.
Summary: Afghan residents condemn a video showing what appear to be US forces in Afghanistan urinating on the bodies of dead Taliban fighters.
WASHINGTON (PAN): The United States Marine Corps has launched an investigating into the authenticity of a video, widely being circulated on the internet, showing its soldiers urinating on the Taliban's dead bodies.
A WOMAN who claimed she had been kidnapped at gunpoint and driven around by three masked men was caught on CCTV urinating in the street at the time she claimed to have been snatched.