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Urination, also known as micturition or voiding, is the process of expelling urine from the body. It involves the coordinated effort of the urinary system, including the kidneys, bladder, and urethra, to collect, store, and eliminate liquid waste. In healthy adults, urination is typically under voluntary control, but it can also occur as a reflex in some cases.
Here’s a more detailed explanation:
1. The Process:
Waste Filtration:
The kidneys filter waste and excess fluid from the blood, producing urine.
Storage:
Urine travels from the kidneys through tubes called ureters and is stored in the bladder.
Sensation and Control:
When the bladder reaches a certain volume (typically around 150-250 mL), a sensation of fullness is triggered. In adults, the process of urination is generally under voluntary control, meaning the brain can choose when to release the urine.