Changes

* 20% of the filtered sodium is reabsorbed thanks to the countercurrent multiplier from the thick ascending limb.

* 20% of the filtered sodium is reabsorbed thanks to the countercurrent multiplier from the thick ascending limb.

* Potassium leaks back into the tubule through special channels

* Potassium leaks back into the tubule through special channels

* As with the [[Proximal Tubule - Anatomy & Physiology| Proximal Tubule]]:

* As with the [[Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology| Proximal Tubule]]:

** Na⁺ / K⁺ ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium

** Na⁺ / K⁺ ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium

** Potassium is then cleared from the cells using a co-transporter with chlorine

** Potassium is then cleared from the cells using a co-transporter with chlorine