What structure does label (E) refer to in a kidney diagram?

The label referring to the renal pelvis is correct because the renal pelvis is a crucial structure within the kidney that serves as a funnel for urine being transferred from the kidney to the ureter. Located at the innermost part of the kidney, it collects urine produced by the nephrons and is part of the urinary system. The renal pelvis connects directly to the ureter, which channels urine to the bladder for storage.

In contrast, the renal cortex is the outer portion of the kidney where the filtration of blood occurs. The renal medulla is located within the renal cortex and contains the renal pyramids, which are involved in the production of urine. The ureter, on the other hand, is a muscular tube that transports urine from the renal pelvis to the bladder, but it is not a part of the kidney structure itself. Understanding the distinct roles and locations of these structures helps clarify the function of the renal pelvis as essential to the urine collection and transport process.