Question: where does the highest rate of tubular reabsorption occur
Answer: Characteristics of Na reabsorption Characteristic proximal tubule loop of Henle Distal convoluted tubule Collecting duct system S1 S2 S3 descending limb thin ascending limb thick ascending limb connecting tubule initial collecting tubule cortical collecting ducts medullary collecting ducts reabsorption ( % ) 67 % 25 % 5 % 3 % reabsorption ( m moles / day ) ~ 17,000 ~ 6,400 ~ 1,300 ~ 700 Concentration ( m M ) 142 142 100 70 40 electrical driving force ( m V ) - 3 + 3 + 15 - 5 to + 5 - 40 chemical driving force ( m V ) 0 0 - 9 - 19 - 34 electrochemical driving force ( m V )