Fetal hemoglobin has a pair of gamma-globin molecules in place
of the typical beta-globins of adult hemoglobin
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Fetal hemoglobin (Hemoglobin F), Alkali-resistant hemoglobin,
HBF (or Hb F), is the major hemoglobin component in the bloodstream
of the fetus. After birth, it decreases rapidly until only traces
are found in normal.
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Greater than 2% of total hemoglobin is abnormal.
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False
Adult hemoglobin has less affinity for oxygen than fetal hemogloblin. That is why, as an adult female's blood passes BY the placenta, the oxygen diffusses into the fetal blood. Likewise, adult blood, having explelled the carbon dioxide during exhalation, has less concentration of carbon-dioxide than the fetal blood, so it diffuses out of fetal blood into the adult blood. That way, the fetus doesn't need respiration as an oxygen source, nor as a way to rid of waste and carbon dioxide.
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Hemoglobin F, also known as fetal hemoglobin is not found in
adult blood.
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