Physiology At the altitude of 6500 meters, the atmospheric pressure is 347 mmHg. What is the inspired PO2. A 73 mm Hg B 63 mm Hg C 53 mm Hg D 83 mm Hg 💡 Explanation At the altitude of 6500 meters, the atmospheric pressure is 347 mmHg. What is the inspired PO2. ✓ Correct Answer: B. 63 mm Hg