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The medical word for the process of urination is micturition. Micturition is controlled by the central nervous system in your brain and spinal cord.
Urine Urging
When you feel the need to go to the toilet, messages travel from the nerves up to the brain, from here you can start or stop the emptying of your bladder by willpower. When you decide to empty your bladder, the urethra opens up and your bladder contracts until it is empty. Afterwards your bladder returns to the filling phase and the process starts over again.
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