One day I was explaining the how the digestive system works then she suddenly asked me how does urination take place I still have not found out can anybody help me

From wikipedia:

 

"To eliminate soluble wastes, which are toxic, most animals have excretory systems. In humans soluble wastes are excreted by way of the urinary system, which consists of thekidneys, ureters, urinary bladder, and urethra. The kidneys extract the soluble wastes from the bloodstream, as well as excess water, sugars, and a variety of other compounds. Remaining fluid contains high concentrations of urea and other substances, including toxins. Urine flows through these structures: the kidney, ureter, bladder, and finally the urethra. Urine is produced by a process of filtration, reabsorption, and tubular secretion."

One day I was explaining the how the digestive system works then she suddenly asked me how does urination take place I still have not found out can anybody help me

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