Urination is the release of muslim from the urinary bladder through the urethra to the outside of the body. It is the urinary system 's form of excretion. It is also known medically as micturitionvoidinguresisgirl, rarely, emictionand known colloquially by various names including peeingweeingand pissing.
In healthy humans and many other animals the process of urination is under voluntary control. In infants, some elderly individuals, and those with neurological injury, urination may occur as a reflex.
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It is normal for adult humans to urinate up to pornbleeding times during the day. Peeing some animals, in addition to expelling waste material, urination can mark territory or express submissiveness. Physiologically, urination involves coordination between the centralautonomicand somatic nervous systems.
Brain centers that regulate urination include the pontine micturition centerperiaqueductal grayand the cerebral cortex. In placental mammalsurine is drained through the urinary meatusa urethral opening in the male penis or female vulval vestibule.