<Li> In the absence of ADH, water in the renal filtrate is left alone to enter the urine, promoting diuresis . </Li> <Li> When ADH is present, aquaporins allow for the reabsorption of this water, thereby inhibiting diuresis . </Li> <P> The collecting duct system participates in the regulation of other electrolytes, including chloride, potassium, hydrogen ions, and bicarbonate . </P>

Which part of the nephron is closest to the collecting duct