Physiology What is true regarding (A-a)O2 gradient? (A = alveolus; a = aerial) A Normal gradient ~ 15 mmhg (2 kpa) B An increased gradient may be caused by, pulmonary collapse C Venous admixture affects (A-a)O2 gradient D All 💡 Explanation What is true regarding (A-a)O2 gradient? (A = alveolus; a = aerial) ✓ Correct Answer: D. All