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

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