What are facts about old urinary system?

Facts about old urinary system

* The kidneys were thought to produce urine by filtering blood.

* The bladder was thought to store urine until it was released through the urethra.

* The urethra was thought to be a simple tube that carried urine from the bladder to the outside of the body.

* There was no understanding of the role of the kidneys in regulating fluid and electrolyte balance.