Fetus: Red Blood Cells

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Fetus has more red blood cells than an adult. Fetal hemoglobin can load oxygen at partial pressures of oxygen where adult hemoglobin unloads. This takes place in the placenta. So as adult hemoglobin unloads, fetal loads around the fetus' body. The number of red blood cells combined with the increased. Fetal hemoglobin can load oxygen at partial pressures of oxygen where adult hemoglobin unloads. This takes place in the placenta. So as adult hemoglobin unloads, fetal loads around the fetus' body. The number of red blood cells combined with the increased. A fetus heart must beat quickly in order to allow such large amounts of red blood cells to pick up the much needed placental oxygen, it only takes about 30 seconds for a fetal blood cell