Question

Select the correct statements about the factors that affect the affinity between hemoglobin and oxygen.

group of answer choices
A. there is a linear relationship of affinity between oxygen and hemoglobin.
B. decreased blood temperature increases hemoglobin affinity for oxygen.
C. CO₂ increases the affinity of oxygen for hemoglobin so that hemoglobin binds oxygen more strongly.
D. oxygen displaces carbon dioxide from hemoglobin at the pulmonary capillaries
E. decreased O₂ partial pressure diminishes affinity and this favors oxygen unloading to the tissues.
F. with decreasing h concentration, affinity decreases so that more oxygen is released from hemoglobin.

Answer 1

Hemoglobin's oxygen affinity is decreased by elevated CO2 levels or H+ concentration, aiding oxygen release to tissues, whereas decreased O2 partial pressure also promotes oxygen unloading.

Step-by-step explanation:

The affinity of hemoglobin for oxygen is influenced by various factors.

E. Decreased O₂ partial pressure reduces the affinity of hemoglobin for oxygen, thereby promoting the release of oxygen to the tissues. This is crucial during periods of high metabolic activity where tissues require more oxygen.

F. With decreasing H+ concentration, also known as a rise in pH, there is an increased affinity of hemoglobin for oxygen, enabling hemoglobin to hold on to oxygen more tightly. Conversely, an increase in H+ concentration (a drop in pH), often caused by increased levels of CO₂ which forms carbonic acid, reduces hemoglobin's oxygen affinity, leading to oxygen being released to the tissues.

C. CO₂ actually decreases the affinity of hemoglobin for oxygen due to the Bohr effect, facilitating the release of oxygen when and where it is needed.