What are the functions of the papillary duct?

The papillary duct, also known as the duct of Bellini, is responsible for transporting urine from the collecting ducts in the renal pyramids to the minor calyces of the kidney. It plays a crucial role in the final concentration of urine by allowing for the reabsorption of water and solutes under the influence of hormones like antidiuretic hormone (ADH). Additionally, the papillary duct helps maintain the overall balance of electrolytes in the body.