Which of the following increases the affinity of Hb for O2? 1. Decreased 2,3-DPG 2. Decreased PCO2 3. Increased pH 4. Increased temperature

a. 1, 2, and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 3 and 4 only


ANS: B
An increased pH results in a right shift in the O2-hemoglobin dissociation curve resulting in a de-creased affinity.

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