In a normal, healthy adult, blood just leaving the lungs carries its cargo of oxygen at a concentration equivalent to what we would find in a solution at normal body temperature that is under a pressure of 100 mm-Hg of O₂.

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Blood leaving the lungs is fully oxygenated, with oxygen partial pressure (PaO2) around 100 mm-Hg, matching the oxygen concentration in a solution at body temperature under the same pressure.

In a Normal, Healthy Adult, Blood Just Leaving the Lungs