Collecting duct system
（重定向自Cortical collecting tubule）
![](/Images/godic/202501/06/Gray11280246.png")
![Simple columnar epithelium and simple cuboidal epithelium in the collecting ducts of the pig kidney. The walls of the large and small connecting tubules (a and b respectively), the circular structures, are formed by simple columnar epithelium (a) and simple cuboidal epithelium (b).](/Images/godic/202501/06/Gray11330246.png")
![Image depicting an α intercalated cell](/Images/godic/202501/06/Alpha_Intercalated_Cell_Cartoon.svg0246.png")
![Diagram outlining movement of ions in nephron, with the collecting ducts on the right.](/Images/godic/202501/06/Kidney_nephron_molar_transport_diagram.svg0246.png")
The collecting duct system of the kidney consists of a series of tubules and ducts that connect the nephrons to the ureter. It participates in electrolyte and fluid balance through reabsorption and excretion, processes regulated by the hormones aldosterone and vasopressin (antidiuretic hormone).