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. 2016 Nov 16;7:528. doi: 10.3389/fphys.2016.00528

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Copyright © 2016 Fahlman and Madigan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Transpulmonary pressure (P_tp = P_ao–P_eso) pressure, respiratory flow, and O₂ content during three voluntary breaths in a Patagonia sea lion. Positive values represent exhalation. (B) Expanded scale shows the spontaneous breath with times of 0 flow (vertical lines a and b) used to estimate lung compliance.