urination
u·ri·nate
U0149600 (yo͝or′ə-nāt′)urination
Noun | 1. | ![]() |
单词 | urination | |||
释义 | urinationu·ri·nateU0149600 (yo͝or′ə-nāt′)urination
Urinationurination[‚yu̇r·ə′nā·shən]Urination(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. M. IA. RATNER 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. Urination(dreams)urinationurination[u″rĭ-na´shun]As the bladder fills, modulatory centers in the brain prevent the occurrence of contractions. Meanwhile, the sphincter mechanism remains closed under autonomic and somatic nervous system control. During urination, the inhibition of contractions is removed and a reflex originates in the pontine micturition center. That causes the detrusor muscle to contract and the sphincter mechanism to relax. The location of the final output of central nervous system impulses to and from the bladder and sphincter is the sacral micturition center, located in spinal segments 2, 3, and 4, which must be intact for contraction to occur. Injury to the pontine micturition center will compromise the smooth coordination between sphincter mechanism and detrusor muscle, and injury to the brain will affect the volitional control of urine (bladder stability). See also incontinence" >urinary incontinence. u·ri·na·tion(yūr'i-nā'shŭn),u·ri·na·tion(yūr'i-nā'shŭn)Synonym(s): miction, micturition (1) , uresis. Patient discussion about urinationQ. protien in urine what are the causes and preventions Q. How you stop urinating frequently? I don't have any conditions that make me urinate often. I simply drink lots of water... Is there some trick I can employ so that I can still drink lots of water but not have to go to the bathroom so frequently? Q. Today doctor removed my stunt of kidney. It inflamate while urination.. till How long i will feel like this? urination
Synonyms for urination
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