Which of the following best describes the function of the renal pelvis?

The renal pelvis serves a crucial role in the urinary system by acting as a funnel for urine that has been produced by the kidneys. It is located at the central part of the kidney, where it collects urine from the calyces, which are small cup-shaped structures that surround the tips of the renal pyramids. Once urine is collected from the calyces, it is transported from the renal pelvis into the ureter, eventually leading to the bladder for storage and excretion. This anatomical structure does not have a function in urine production, storage, or blood filtration, but rather is specifically designed for the collection and passage of urine. Therefore, this role of collecting urine from the calyces accurately describes the primary function of the renal pelvis.