Question

multiple choice question
oxyhemoglobin appears ____ in color; deoxyhemoglobin appears ____.
darker red; bright red
bright red; darker red
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Explanation:

Oxyhemoglobin, which is hemoglobin bound to oxygen, has a bright red color. Deoxyhemoglobin, which has released oxygen, appears darker red. This is due to the different states of iron in the heme - group of hemoglobin and how they interact with light.

Answer:

B. bright red; darker red