Summary: SO2 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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