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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Sleep Med Rev. 2013 Mar 28;18(1):10.1016/j.smrv.2012.12.003. doi: 10.1016/j.smrv.2012.12.003

Fig. 4.

Fig. 4

Although we breathe room air, by the time oxygen diffuses to the tissue, there is a relative hypoxia in the tissue, and the amount of hypoxia varies from tissue to tissue as well as the distance of the cells from capillaries. Reproduced by permission from Macmillan Publishers Ltd: Nature Reviews Immunology, Sitkovsky and Lukashev copyright 2005.176