Final answer:
The renal pelvis is the expanded extension of the ureter, where urine collects before it passes to the bladder.
Step-by-step explanation:
The renal pelvis is an expanded extension of the ureter. This region in the kidney is where the calyces join the ureters, forming a funnel-like end where urine collects before being transported through the ureter to the urinary bladder. Therefore, the correct answer is 2) Pelvis; ureter. The renal pelvis collects urine from the renal calyces, which merge to form this funnel-shaped structure at the hilum of each kidney. The renal pelvis then narrows down to become the ureter, which carries urine to the urinary bladder.