Summary: of haemoglobin The total CO2 concentration of blood rises with the PaCO2 and the CO2 dissociation curve is almost linear in the physiological range between 40 and 50 mmHg Fig 15 2 In mixed venous blood the oxygen saturation SO2 is 75 and the CO2 concentration is larger for a given PCO2 than in arterial blood Fig 15 2 This is a general
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