1. what is the % o2 saturation of hemoglobin in the blood within lung tissue where the partial pressure of o2 = 80 mm hg? 100% 2. what is the % o2 saturation of hemoglobin in the blood of resting leg muscle where the partial pressure of o2 = 40 mm hg? 75% 3. when your leg muscle is resting, what percent of o2 does hemoglobin unload (compared to the lung)? 4. if the partial pressure of o2 in the blood of your running leg muscle is 30 mm hg, what percent of its o2 does hemoglobin unload there (compared to the lung)?