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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 ?
Chen suggests is called "timed voiding." The idea is to make more frequent bathroom visits (for example, hourly) to urinate on a regular basis.
Even more (69%) were interested in a natural dietary supplement that could reduce the likelihood of needing to urinate at night.
Lawyer Al Gailani defended before presiding judge Dr Ali Al Galadari: "My client was forced not to give the urine sample because he could not urinate ...
Dogs can be as fussy as cats about the substrate on which they urinate. When you take him out to urinate, where does he urinate--that is, which surface does he choose?
* Identify your pelvic floor muscles while you urinate. (You use these muscles to halt urination and keep from passing gas.)
Although our patient could not urinate before the surgery, as seen in the pressure flow study, she did urinate easily after surgery during the uroflow investigation.
A group of feminists on Monday protested the lack of a female minister in Ukraine's all-male cabinet, pretending to urinate outside the government headquarters.
It seems to us that they have given him and others a licence to urinate wherever he likes.
If the cat in question has been neutered, has received a clean bill of health and continues to use his litter box on a regular basis, then what else could be driving him to urinate outside his box?
Drinking alcohol might put you out, but won't guarantee a good night's rest for it can prevent deep (or delta) sleep and increase the need to awaken to urinate. A better fix is to seek psychological expertise to get at the root of your anxiety.
The new product, which contains an extract of bearberry leaves as an active ingredient, helps alleviate urinary symptoms such as discomfort when urinating and a constant urge to urinate.
Well, it's difficult to define "normal." Most people urinate around six to seven times a day.