In which of the mentioned segments of a nephron, Na+ reabsorption primarily occurs by the Na+-H+ exchange?
In the PCT, the apical membrane has Na+/H+-antipoer, which couples H+ secretion with the Na+ movement across the apical membrane. In the TAL of loop of Henle:- The sympoer NKCC moves 1 Na+, 1 K+, 2 Cl- through the apical membrane into the cell. In DCT:- The sympoer is NCC. In the late distal tubule and collecting duct:- Na+diffuses across the apical membrane through the epithelial Na+ channel (ENaC).
PCT
loop of Henle
DCT
Collecting duct
Excretory System (Kidney, Bladder) Acid-Base Balance