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. 2022 May 19;12(5):754. doi: 10.3390/life12050754

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Oxygen tensions in the body. Reduction of oxygen tensions at different levels of airways, arteries, and tissues after breathing air at sea level and 1.3 ATA and breathing 100% oxygen at sea level and 2.5 ATA. (ATA = atmospheres absolute; PO₂ = partial pressure of oxygen; PAO₂ = partial pressure of oxygen in alveoli; PaO₂ = partial pressure of oxygen in arteries; PtO₂ = partial pressure of oxygen in tissues. PmO₂ = partial pressure of oxygen in mitochondria. * Estimations through extrapolations).