4)renal regulation (1 acidification of proximal renal tubule 血管 肾小管上皮管腔 N Nat cl HCO 3 K H2 CO3 H2 CO3 NH3 Nat CA HCO3 H20+CO2 H20 泌与Cr重吸收拮抗与泌NH3协同4) renal regulation ① acidification of proximal renal tubule 血管 肾小管上皮 管腔 Na+ Cl￾HCO- 3 H2CO3 H20 泌H+ 与Cl- 重吸收拮抗与泌NH3协同 K+ NH3 Na+ H+ H2CO3 Na+ C.A. HCO- 3 H2O+CO2