Figure 4.14 - Oxygen dissociation curves for blood of fetal lambs and their mothers, illustrating the arteriovenous difference, i.e. the effect on oxygen delivery. At similar arterial and venous oxygen levels, the A-V oxygen difference is greater for maternal than for fetal blood. Accordingly, each volume of newborn blood containing fetal hemoglobin will provide one-third as much oxygen as blood with adult hemoglobin.
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