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首页> 外文期刊>The Journal of Experimental Biology >Differential air sac pressures in diving tufted ducks Aythya fuligula
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Differential air sac pressures in diving tufted ducks Aythya fuligula

机译：潜水簇绒鸭Aythya fuligula中的气囊压力差

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摘要

The air in the respiratory system of diving birds contains a large proportion of the body oxygen stores, but it must be in the lungs for gas exchange with blood to occur. To test the hypothesis that locomotion induces mixing of air sac air with lung air during dives, we measured differential pressures between the interclavicular and posterior thoracic air sacs in five diving tufted ducks Aythya fuligula. The peak differential pressure between posterior thoracic and interclavicular air sacs, 0.49 +/- 0.13 kPa (mean +/- S.D.), varied substantially during underwater paddling as indicated by gastrocnemius muscle activity. These data support the hypothesis that locomotion, perhaps through associated abdominal muscle activity, intermittently compresses the posterior air sacs more than the anterior ones. The result is differential pressure fluctuations that might induce the movement of air between air sacs and through the lungs during dives. [References: 16]
机译：潜水鸟呼吸系统中的空气包含人体中大部分的氧气储存，但必须在肺中才能与血液发生气体交换。为了检验运动在潜水过程中引起气囊空气与肺空气混合的假设，我们测量了五只潜水簇绒鸭子Aythya fuligula的锁骨间和后胸腔气囊之间的压差。腓肠肌的活动表明，在水下划桨时，后胸囊和锁骨间气囊之间的峰值压差为0.49 +/- 0.13 kPa（平均+/- S.D.）。这些数据支持这样的假设，即运动可能通过相关的腹部肌肉活动，间歇性地压缩后气囊的压力大于前气囊的压缩。结果是压差波动，可能会导致潜水期间气囊之间以及穿过肺部的空气运动。 [参考：16]

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