In proximal tubule, HCO3 is absorbed with the step of
HCO3 is absorbed with the step of Na+ - H+ exchanger Ref: Ganong's review of medical physiology; 24th edition; page no; 680 Ref of imag :
Na+ Cl cotranspoer
Na+ - K+2Cl contraspoer
Na+ - H+ exchanger
Na+ -K+ exchanger
Renal physiology