Blood pressure in snakes from different habitats

@article{Seymour1976BloodPI,
  title={Blood pressure in snakes from different habitats},
  author={Roger S. Seymour and Harvey B. Lillywhite},
  journal={Nature},
  year={1976},
  volume={264},
  pages={664-666}
}
SNAKES seem to have evolved from burrowing lizards and are experiencing an impressive adaptive radiation. Terrestrial forms represent the probable ancestral type which gave rise to several lines of divergent radiation into aquatic and arboreal habitats1,2. These shifts in habitat may have affected blood pressure regulation in snakes which, because of their shape, are inordinately subject to the hydrostatic effects of gravity. By acquiring aquatic habits, some species have eliminated most of the… 

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References

SHOWING 1-4 OF 4 REFERENCES

Anaerobic Brain Function: Effects of Stagnant and Anoxic Anoxia on Persistence of Breathing in Reptiles

Analyses of plasma indicate that loss of brain function in anoxic crocodiles is not caused by systemic acidosis or hypoglycemia, and it is suggested that the ability of the central nervous system of the turtle to function without oxygen is due to a comparatively high rate of anaerobic uptake or metabolism of glucose.

Regulation of arterial blood pressure in the common green iguana.

  • L. Hohnke
  • Medicine
    The American journal of physiology
  • 1975
It is concluded that hemorrhage and passive head-up tilting can induce reflex cardiovascular changes that assist ABP regulation in iguanas.