-On the accompanying graph, the shift from curve A to curve B could be caused by

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[Chapter 4, IV A 2, C; Figure 4.7]. Because fetal hemoglobin (HbF) has a greater affinity for $\mathrm{O}_{2}$ than does adult hemoglobin, the $\mathrm{O}_{2}$-hemoglobin dissociation curve would shift to the left. Carbon monoxide poisoning would cause a shift to the left, but would also cause a decrease in total $\mathrm{O}_{2}$-carrying capacity (decreased percent saturation) because $\mathrm{CO}$ occupies $\mathrm{O}_{2}$-binding sites. Decreased pH, increased temperature, and increased 2,3-diphosphoglycerate (DPG) all would shift the curve to the right.

-On the Accompanying Graph, the Shift from Curve a to Curve