12/14/2023 0 Comments Functional dead space in lungs cycle![]() ![]() ![]() The average s C L of dolphins was 0.31☐.04 cmH 2O −1, which is considerably higher than that of humans (0.08 cmH 2O −1) and that previously measured in a pilot whale (0.13 cmH 2O −1). The esophageal pressures indicated that expiration is passive during voluntary breaths, but active during maximal efforts, whereas inspiration is active for all breaths. Our results indicate that bottlenose dolphins have the capacity to generate respiratory flow rates that exceed 130 l s −1 and 30 l s −1 during expiration and inspiration, respectively. The data were used to estimate the dynamic specific lung compliance (s C L), the O 2 consumption rate ( V̇ O 2) and CO 2 production rates ( V̇ CO 2) during rest. We measured esophageal pressures, respiratory flow rates, and expired O 2 and CO 2 in six adult bottlenose dolphins ( Tursiops truncatus) during voluntary breaths and maximal (chuff) respiratory efforts. ![]()
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