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Blood. Tubular cell. HCO 3 -. HPO 4 --. +. +. HCO 3 -. H +. +. H +. H +. Tubular fluid. CA. +. H 2 PO 4 -. CO 2. CO 2. H 2 O. +. Glutamine. H 2 O. 2 NH 4 +. a Ketoglutarate. 2 NH 3. Glucose. +. 2 H + + 2HCO 3 -. 2 H +. CA. 2 NH 4 +. 2 CO 2 + 2 H 2 O. Urine:.
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Blood Tubular cell HCO3- HPO4-- + + HCO3- H+ + H+ H+ Tubular fluid CA + H2PO4- CO2 CO2 H2O + Glutamine H2O 2 NH4+ a Ketoglutarate 2 NH3 Glucose + 2 H++ 2HCO3- 2 H+ CA 2 NH4+ 2 CO2+ 2 H2O Urine: NH4+ (20 mmol/day) (40 mmol/day) H+ excretion in kidney