A left shift in the oxyhemoglobin dissociation curve is caused by:
a. methemoglobin.
b. acute acidosis.
c. increased temperature.
d. high 2,3-diphosphoglycerate (2,3-DPG).
ANS: A
Methemoglobin will increase hemoglobin's affinity, causing a left shift in the oxyhemoglobin dissociation curve. Acute acidosis, hyperthermia, and increased levels of 2, 3-DPG will decrease hemoglobin affinity.
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