Physiology What is the expected mixed venous oxygen tension, in mm Hg, in a normal adult after breathing 100% oxygen for 10 minutes? A 150 B 740 C 45 D 573 💡 Explanation What is the expected mixed venous oxygen tension, in mm Hg, in a normal adult after breathing 100% oxygen for 10 minutes? ✓ Correct Answer: C. 45