What is the main function of the renal pelvis?

The renal pelvis plays a crucial role in the urinary system, primarily serving as a funnel that collects urine from the kidney's collecting ducts and directs it into the ureter. This anatomical structure is located at the central region of the kidney and acts as a conduit, transporting the urine generated in the kidneys to the bladder for storage and eventual elimination from the body.

Understanding the renal pelvis's function helps clarify its importance in the urinary tract. While the kidneys are responsible for filtering blood and producing urine, the renal pelvis is specifically adapted for the transportation of that urine. The other options, such as filtering blood or producing urine, are functions carried out by the kidneys themselves rather than the renal pelvis. Similarly, storing urine is a function attributed to the bladder, which holds the urine until it is ready to be expelled from the body.