the emptying of the urinary bladder (the activity)
Urination is how animals and humans remove urine from their bodies. Urine is the scientific term for "pee", the liquid bodily waste filtered out of the bloodstream by kidneys and from the liquids that a person drinks. The bladder temporarily holds the waste fluid.
The Human Male Urinary System
The Human Female Urinary System
Male and female urethral openings
Vulva diagram with C for clitoris, urinary meatus marked U, and vaginal opening below with a V; VV - vestibule of the vagina; H - hymen,LM - one of the labia majora; Lm - labia minora