Metabolic processes generate acids C S H+- 100 nmol/L H Artery H+- 36 nmol/L H+ H+ pH~7.4 H+ Capillary H+- 44 nmo/L pH-7.36 VeinMetabolic processes generate acids H+ ~ 100 nmol/L (pH ~ 7) Artery Vein H+ ~ 36 nmol/L pH~7.4 H+ ~ 44 nmol/L pH~7.36 H+ H+ H+ H+