Oxygen unloading in a red blood cell due to declining pH is
called the Bohr effect. The normal pH of the body is 7.4.
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A decrease in pH (acidosis) weakens the hemoglobin-oxygen
bond.
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All hemoglobin has something called the Bohr effect, which is a
negative effect of binding oxygen by hemoglobin in the presence of
acid. This effect is some what exaggerated in diving mammals.