Select the correct statement about oxygen transport in blood. A) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently. B) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity. C) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal. D) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O₂.

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C) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal. This is because during increased physical activity, tissues consume more oxygen, lowering the saturation level of hemoglobin with oxygen in the blood returning to the lungs compared to resting conditions.

Select the Correct Statement About Oxygen Transport in Blood