試題詳解

39. The "hemoglobin O₂ dissociation curve":
(A) reflects about 50% saturation of hemoglobin in the alveoli.
(B) shifts to the left when the pH decreases.
(C) demonstrates that hemoglobin holds less O₂when the pH is higher.
(D) proves lack of dependence on CO₂ levels.
(E) explains how hemoglobin can bind O₂ at high pH in the lungs and release it at lower pH in tissue.