Overview
Urine is the liquid waste product excreted by the kidneys. It is stored in the bladder until it is emptied out through the urethra.
Review Date 1/1/2023
Updated by: Kelly L. Stratton, MD, FACS, Associate Professor, Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.