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. Author manuscript; available in PMC: 2022 Sep 27.
Published in final edited form as: J Breath Res. 2021 Sep 27;15(4):10.1088/1752-7163/ac2589. doi: 10.1088/1752-7163/ac2589

Figure 1.

Figure 1.

Conceptual diagram of O2 transport from the face to the brain as adapted from NASA PBA study. Despite adequate input air, there are potential losses from various physiological factors including bronchoconstriction, pulmonary inflammation, and impaired circulation (NASA PBA Report 2020).