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Nitrogen is much less reactive than oxygen. Indeed, if I haven't totally forgotten my long-ago chemistry courses, most chemical reactions involving N2 are energy-consuming. Thus you get nitrogen compounds produced by lightning, in auto engines, and other places where there's a lot of energy to spare. Oxygen reactions, OTOH, are energy-producing. You ...


In this paper the authors measured decrease of arterial blood oxygen saturation in healthy and patients with sleep apnae (this latter part is not really relevant only the measurements in healthy individuals). They found that fall of oxygen saturation depends on the initial saturation rate, but is not affected by the breath-holding time. As you can see on ...

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