Q: Select the correct statement about oxygen transport in blood
1. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal
2. During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
3. During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently
4. Increased BPG levels in the red blood cells enhance oxygen-carrying capacity
Answer
2. “During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2”