Which structure connects the kidneys to the bladder?

The structure that connects the kidneys to the bladder is the ureters. These are two thin tubes that transport urine from each kidney to the urinary bladder. Each ureter originates from the renal pelvis of a kidney and travels down to the bladder, where it plays a critical role in the urinary system by allowing for the temporary storage of urine before it is eliminated from the body through the urethra. The ureters have muscular walls that contract in a rhythmic fashion to facilitate the movement of urine, ensuring that it flows smoothly from the kidneys to the bladder.

Other options, such as the urethra, are involved in the process of urine elimination but do not connect the kidneys to the bladder. The scrotum is a pouch that contains the testes in males and has no relation to the urinary system, while the fallopian tubes are part of the female reproductive system and are not involved in the urinary process at all. Thus, the ureters are correctly identified as the anatomical structures responsible for connecting the kidneys to the bladder.