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(2) Cl~-的重吸收 Cl~-的重吸收在近球小管处是伴随Na~+的重吸收而被动重吸收的,从电位低处扩散到电位高处。在髓袢升枝粗段,Cl~-的重吸收是主动过程,而Na~+的重吸收是被动过程。 (3) HCO_(3)~-的重吸收HCO_(3)~-在血浆及小管液中是以钠盐(NaHCO_3)的形式存在的。可解离为Na~+和HCO_(3)~-。肾小管细胞能分泌H~+。H~+与小管液中的Na~+进行交换,使Na~+进入细胞并和细胞内产生的HCO_(3)~-一起转运回血。余下的HCO_(3)~-与H~+
(2) Reabsorption of Cl ~ - The reabsorption of Cl ~ - is passively reabsorbed with the reabsorption of Na ~ + in the proximal tubule and diffuses from the lower potential to the higher potential. In the thick section of the thickened pulp, Cl ~ - reabsorption is the active process, and Na ~ + reabsorption is a passive process. (3) The reabsorption of HCO_ (3) ~ - HCO_ (3) ~ - is in the form of sodium salt (NaHCO_3) in plasma and small tube fluid. Can be dissociated into Na ~ + and HCO_ (3) ~ -. Tubular cells can secrete H ~ +. H ~ + exchange with the Na ~ + in the small tube of liquid, so that Na ~ + into the cells and intracellular generated HCO_ (3) ~ - transported back to the blood together. The remaining HCO_ (3) ~ - and H ~ +