Final answer:
The ureter is the structure that transports urine from the kidneys to the bladder.
Step-by-step explanation:
The structure that transports urine from the kidneys to the bladder is the ureter. Each kidney is connected to the bladder via one ureter. The function of the ureters is to carry urine from the renal pelvis in the kidney down through the abdomen to the urinary bladder. The walls of the ureter contain smooth muscle and are lined with transitional epithelium, allowing for the peristaltic movement of urine towards the bladder. Once the urine reaches the bladder, it is stored until the bladder is half full and a nerve impulse triggers the sphincters to relax during urination. Urine then moves from the bladder and is carried out of the body by another structure, the urethra.