Which of the following is correct regarding acclimatization?
A) At high altitudes, hemoglobin's affinity for O2 is increased because BPG concentrations increase.
B) High-altitude conditions always result in lower-than-normal hemoglobin saturation levels because less O2 is available to be loaded.
C) Decreases in arterial PO2 cause the peripheral chemoreceptors to become less responsive to increases in PCO2.
D) When blood O2 levels decline, the kidneys produce more erythropoietin, which stimulates breakdown of red blood cells in the spleen.
B
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