Foster J M, Forster M E
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand,
J Comp Physiol B. 2007 Jan;177(1):31-9. doi: 10.1007/s00360-006-0106-7. Epub 2006 Jul 26.
Arterial and venous pressures were measured in hagfishes subjected to acute changes in salinity. The osmotic pressure of the seawater (SW) was increased or decreased by approximately 10%. Sixty minutes after the change in medium osmolarity the osmotic pressure of the blood corresponded with that of the medium. Following transfer to 90% SW all measured parameters changed as predicted for a passive increase in blood volume, apart from the pressure in the posterior cardinal vein (PCV) which fell. By 2 h dorsal aortic (DA) pressure and pressure in the PCV and supraintestinal vein had returned to pre-change values. In contrast, following exposure to 110% SW, pressures fell and apart from the supraintestinal vein they remained low at 120 min. At 24 h, DA pressure was lower than pre-change values for both groups. The data are consistent with the concept of central venous tone being regulated in hagfishes, which cope better with volume expansion than volume depletion.
在遭受盐度急性变化的盲鳗中测量动脉压和静脉压。海水（SW）的渗透压升高或降低约10%。介质渗透压变化60分钟后，血液渗透压与介质渗透压相对应。转移到90%SW后，除了后主静脉（PCV）压力下降外，所有测量参数都如预期的那样随着血容量被动增加而变化。到2小时时，背主动脉（DA）压力以及PCV和肠上静脉的压力已恢复到变化前的值。相比之下，暴露于110%SW后，压力下降，除肠上静脉外，在120分钟时它们仍保持较低水平。在24小时时，两组的DA压力均低于变化前的值。这些数据与盲鳗中中央静脉张力受到调节的概念一致，盲鳗应对容量扩张的能力比容量减少更强。
