(Kelly of the Clue Crew shows an anatomical diagram on the monitor.)  It's the 2-word term for the continuous anatomical system that contains the kidneys, the ureters, the bladder & the urethra
The bladder stores urine until it is ready to be... [DOC] [TLE] The Bladder (Human Anatomy): Function, Picture, Location, Definition [PAR] WebMD's Bladder Anatomy Page provides a detailed image and definition of the 
bladder and describes its function, location in the body, and conditions that ... 
Urine is made in the kidneys, and travels down two tubes called ureters to the 
bladder.