A High PCO₂ Would Tend to Decrease the Blood PH

Multiple Choice

A high PCO₂ would tend to decrease the blood pH by forming carbonic acid. However, it also stimulates the release of oxygen from oxyhemoglobin, and this minimizes the pH change because

A) deoxyhemoglobin is a weaker acid than oxyhemoglobin.
B) the hemoglobin iron undergoes alternate oxidation and reduction.
C) the heme group is in a hydrophobic environment.
D) deoxyhemoglobin is a stronger acid than oxyhemoglobin.
E) hemoglobin has less binding capacity for oxygen than myoglobin.