The urine is taken from the kidneys to the bladder by the ureters. The bladder stores the urine until it is convenient to expel it from the body. Note that 'ureter' differs from the word 'urethra'.

The function of the ureter is to carry the urine produced in the kidney to the bladder, where it is eventually urinated out. Ureteropelvic junction obstruction occurs when the junction (called the ...