Which structure transports urine from the kidney to the bladder?

• A. Urethra
• B. Ureter
• C. Renal pelvis
• D. Collecting duct

Answer: (B)

Urine moves from the kidney to the bladder through a muscular tube that uses rhythmic contractions to push the fluid along. This tube is the ureter. It begins at the renal pelvis, where urine collected from the kidney’s collecting ducts funnels into it, and it travels down to the bladder, delivering urine via peristalsis. The urethra, by contrast, carries urine out of the body from the bladder, not from the kidney to the bladder. The renal pelvis is the funnel inside the kidney that collects urine before it enters the ureter, and the collecting duct is a kidney structure that drains into the renal pelvis rather than directly to the bladder.