Hemoglobin’s affinity for O₂
(A) Decreases as blood pH decreases
(B) Increases as H⁺ concentration increases
(C) Increases as blood pH decreases
(D) Decreases as OH⁻ concentration increases

The affinity of hemoglobin for oxygen is reduced by many factors, including low pH and high CO₂. The graph below shows the different dissociation curves that maternal (normal) hemoglobin and fetal hemoglobin have.

Transcribed Image Text:

Percent Saturation of Hemoglobin 100 90 80 70 60 50 40 30 20 10 Fetal Maternal 0 10 20 30 40 50 60 70 80 90 100 pO₂(mm Hg)