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. 2016 Feb 9;10:4. doi: 10.1186/s13036-016-0025-4

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© Johnson. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Oxygen delivery to the muscles is a multistep process, beginning with gas exchange in the lungs (right), being transported in the blood (middle), and finally being used in the muscles (left)