-The shift from curve A to curve B is associated with

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[Chapter 4, IV C 2]. A shift to the left of the $\mathrm{O}_{2}$-hemoglobin dissociation curve represents an increased affinity of hemoglobin for $\mathrm{O}_{2}$. Accordingly, at any given level of $\mathrm{PO}_{2}$, the percent saturation is increased, the $\mathrm{P}_{50}$ is decreased (read the $\mathrm{PO}_{2}$ at $50 \%$ saturation), and the ability to unload $\mathrm{O}_{2}$ to the tissues is impaired (because of the higher affinity of hemoglobin for $\mathrm{O}_{2}$ ). The $\mathrm{O}_{2}$-carrying capacity is determined by hemoglobin concentration and is unaffected by the shift from curve A to curve B.

-The Shift from Curve a to Curve B Is Associated P50\mathrm{P}_{50}P50​

-The Shift from Curve a to Curve B Is Associated $\mathrm{P}_{50}$