School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.
J Fish Biol. 2011 Jul;79(1):280-9. doi: 10.1111/j.1095-8649.2011.03028.x. Epub 2011 Jun 15.
The rate of velar movement in Eptatretus cirrhatus, as determined by electromyography, increased with Q(10) 3·2 during exposure to temperatures between 7 and 19° C and increased 3·9 fold during exposure to hypoxia (oxygen partial pressure = 6·67 kPa). This confirms the role of the velum in generating respiratory currents and modification of its activity in response to changes in metabolic demand or environmental oxygen availability. The maximum velar rate observed was 168 beats min(-1) , higher than that recorded in any hagfish species to date. Fibres of musculus craniovelaris were exclusively small, red (slow-twitch) fibres, consistent with a high aerobic capacity required by fibres involved in rhythmic, ongoing activity.
电生理学测定表明，七鳃鳗的软腭运动速率(Q10 为 3.2)随温度在 7-19°C 范围内的升高而增加，在低氧环境(氧分压=6.67kPa)下增加 3.9 倍。这证实了软腭在产生呼吸流中的作用，以及其活性在响应代谢需求或环境氧可用性变化时的改变。观察到的最大软腭速率为 168 次/分钟，高于迄今为止在任何七鳃鳗物种中记录到的速率。颅舌肌纤维完全是小的、红色的(慢收缩)纤维，与涉及节律性持续活动的纤维所需的高需氧量一致。
