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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

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 Sany
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It is the presence of oxygen-bound hemoglobin that makes it bright red
User TonyUser
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