WebWhen the oxygen saturation falls below 89 percent, or the arterial oxygen pressure falls below 60 mmHg — whether during rest, activity, sleep or at altitude — then supplemental oxygen is needed. Your health care … WebEarth’s present atmosphere is notable for its remarkably high concentration of ~21% by volume of molecular oxygen (O 2) upon which all complex life depends, whereas geologic and geochemical constraints suggest that before ~2.45 billion years ago (Ga), the atmosphere was essentially devoid of this gas (1–4).The rise of the atmospheric O 2 …
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