Physiology Bohr effect is described as: September 2009 A Decrease in CO2 affinity of hemoglobin when the pH of blood rises B Decrease in CO2 affinity of hemoglobin when the pH of blood falls C Decrease in O2 affinity of hemoglobin when the pH of blood rises D Decrease in O2 affinity of hemoglobin when the pH of blood falls 💡 Explanation Bohr effect is described as: September 2009 ✓ Correct Answer: D. Decrease in O2 affinity of hemoglobin when the pH of blood falls