Mixed venous blood in a resting individual still contains more than double the amount of oxygen extracted by the tissues as the blood passed through them.

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Quizplus · Accepted Answer

Mixed venous blood is the blood that returns to the heart after passing through the tissues. It still contains around 75% of the oxygen that it had when it entered the tissues, which means that the tissues extracted around 25% of the oxygen from the blood during this process. Therefore, mixed venous blood still contains more than double the amount of oxygen that was extracted by the tissues.

Mixed Venous Blood in a Resting Individual Still Contains More