Sodium Reabsorption in the Proximal Tubule (N/A)

Sodium reabsorption in the proximal tubule is a critical physiological process by which approximately 65% of filtered sodium ions (Na⁺) are reclaimed from the glomerular filtrate back into the bloodstream. This process occurs primarily in the proximal convoluted tubule (PCT) of the nephron and is essential for maintaining extracellular fluid volume, blood pressure, and overall electrolyte balance. The driving force is the basolateral Na⁺/K⁺ ATPase pump, while sodium enters cells via apical transporters like NHE3 and SGLT2/SGLT1. Water follows sodium osmotically, resulting in isosmotic reabsorption. This process is modulated by factors such as angiotensin II and ANP and is a target for drugs like SGLT2 inhibitors used in diabetes management.

Other names

Proximal Tubule Sodium TransportPCT Sodium ReabsorptionRenal Sodium Handling in Proximal Tubule

N/A