Bicarb determined by CO2 in gas phase.CO2 is determined by CO2 in the Lungs=> CO2 content depends on metabolism and rate of breathing.Release H ions => react with bicarb-> carbonic acid -> converted to CO2 and out of the lungs. (Carbonic Acid not really change)OH Ions release => react with Carbonic Acid => Bicarb => CO2 dissolved => Carbonic Acid Unchanged.**Removing CO2 from blood by lungs INCREASE pH*Removing HCO3- (Bicarb) from blood pH by kidneys lower pH
