We all know, that Mount Everest is the world’s tallest peak. Thus, at the top of the peak, the level of oxygen is very low compared to the base camp. However, It is just possible for a man to reach the summit of Everest without supplementary oxygen, this can only be done at the expense of extreme hyperventilation and respiratory alkalosis, and even then the arterial PO2 is less than 30 Torr.