<prompt> Where in the kidney does active reabsorption of sodium ions occurCollecting ductDistal tubuleAscending limb of HenleAll of the above  <response>: Other than at thin descending limb of the loop of Henle, all other sites of tubule Na are reabsorbed by various mechanisms.- Proximal tubule- 60-70Na- H exchangeNa- Glucose co-transportNa- amino acid co-transportNa unitransport- The thick ascending limb of the loop of Henle - 30Na- 2Cl-- K co-transport- Early distal tubule- 7Na- Cl- co-transport- Late distal tubule and collecting duct - 3ENaC channels 