Questions for Respiratory System Related

Review Questions for Respiratory System related questions and content

All of the following shift the oxygen dissociation curve to the right EXCEPT

  • A. Decreased pH
  • B. Increased temperature
  • C. Carbon monoxide
  • D. Increased 2.3 DPG
Correct Answer: C

Rationale: The correct answer is C: Carbon monoxide. Carbon monoxide binds to hemoglobin with a higher affinity than oxygen, shifting the oxygen dissociation curve to the left, not the right. Decreased pH, increased temperature, and increased 2,3 DPG all shift the curve to the right by decreasing hemoglobin's affinity for oxygen. This results in easier unloading of oxygen to tissues.