試題詳解

25. Which of the following statements about the physiology of gas exchange in humans and the properties of hemoglobin is NOT correct?
(A) Hemoglobin's affinity for oxygen decreases in the presence of high carbon dioxide levels, a phenomenon known as the Bohr effect, which enhances oxygen release in tissues where CO₂is abundant.
(B) Fetal hemoglobin (HbF) has a higher affinity for oxygen compared to adult hemoglobin (HbA), facilitating the transfer of oxygen from the mother's bloodstream to the fetus.
(C) The Haldane effect describes how deoxygenated hemoglobin can carry more carbon dioxide, as oxygenation of blood in the lungs displaces carbon dioxide from hemoglobin, reducing its affinity for CO₂.
(D) Myoglobin, with its single oxygen﹣binding site, has a lower affinity for oxygen than hemoglobin, making it less effective in oxygen transport but more effective in oxygen storage.
(E) During intense exercise, the local increase in temperature and hydrogen ion concentration in muscles reduces hemoglobin's affinity for oxygen， enhancing oxygen delivery to active tissues.