Why does Hb F have a higher oxygen affinity than adult hemoglobin?
a. Fetal blood has a higher pH than adult blood.
b. Fetal blood has a higher hematocrit than adult blood.
c. Body temperature is lower in fetus.
d. It is necessary to extract oxygen from the maternal blood supply.
ANS: D
The fetus has a need for oxygen. In order for the fetus to extract oxygen from the mother's blood (cord blood), its affinity for hemoglobin must be higher than that of the mother.
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