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Define the term hemoglobin F

Define the term hemoglobin F? Why does fetus require different hemoglobin?

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Hemoglobin F is a hemoglobin found in the mammalian fetus and hemoglobin A is the common hemoglobin. Hemoglobin F has greater affinity for oxygen.

The fetus requires hemoglobin capable of extracting oxygen from mother’s circulation. Thus the fetus employs hemoglobin F as it has higher affinity for oxygen than the mother’s hemoglobin.

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