Physiology CO has higher affinity for hemoglobin. The affinity of CO for Hb as compared to O2 is approximately: A 120 times B 210 times C 240 times D 360 times 💡 Explanation CO has higher affinity for hemoglobin. The affinity of CO for Hb as compared to O2 is approximately: ✓ Correct Answer: B. 210 times