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Why is the blood that flows from the lungs toward the heart a brighter red than the blood that flows the other direction?
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Why is the blood that flows from the lungs toward the heart a brighter red than the blood that flows the other direction?

User Jsmarkus
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b. the presence of oxygen-bound hemoglobin makes it bright red
User Abhishek Sachan
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There is more oxygen near the lungs, because fresh oxygen goes into the lungs.
User Saikiran Yerram
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