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Urination is the release of urine from the urinary bladder through the urethra to the outside of the body. It is also known medically as micturition, voiding, uresis, or, rarely, emiction, and known colloquially by various names including peeing, weeing, and pissing.

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Physiologically, urination involves coordination between the central, autonomic, and somatic nervous systems.

Brain centers that regulate urination include the pontine micturition center, periaqueductal gray, and the cerebral cortex.

The muscles controlling micturition are controlled by the autonomic and somatic nervous systems.

During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation.

It is normal for adult humans to urinate up to seven times during the day.

In some animals, in addition to expelling waste material, urination can mark territory or express submissiveness.When the individual is ready to urinate, he or she consciously initiates voiding, causing the bladder to contract and the outlet to relax.Voiding continues until the bladder empties completely, at which point the bladder relaxes and the outlet contracts to re-initiate storage.This powerful fuck machine can do deeper into this babe's pussy than any man ever could.It thrusts deep inside her and makes her cum so hard.The state of the reflex system is dependent on both a conscious signal from the brain and the firing rate of sensory fibers from the bladder and urethra.