Blood pressure in snakes from different habitats

  title={Blood pressure in snakes from different habitats},
  author={Roger S. Seymour and Harvey B. Lillywhite},
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… 

Circulatory adaptations of snakes to gravity

Snakes provide diverse and particularly useful models for examining cardiovascular adaptations to gravity, including mechanisms of function and the evolution of cardiovascular design.

Phylogeny, Ecology, and Heart Position in Snakes

The results suggest that overcoming gravitational pressure gradients in snakes most likely involves the combined action of several cardiovascular and behavioral adaptations in addition to alterations in relative heart location.

Scaling of cardiovascular physiology in snakes

The added stress on the ventricle wall in larger snakes is correlated with ventricles that are larger than predicted by other reptiles, and the spongy hearts of reptiles do not conform well to the Principle of Laplace.

Aquatic locomotion and behaviour in two disjunct populations of Western Australian tiger snakes, Notechis ater occidentalis

This study suggests strong behavioural flexibility in tiger snakes depending on habitats, with greater apnoea capacities and faster burst swimming speed than island snakes.

Gravity and the evolution of cardiopulmonary morphology in snakes.

Morphological adaptations to arboreal habitats and heart position in species of the neotropical whipsnakes genus Chironius

An ecological and a phylogenetic approach is used to explore the relationship between habitat, HP, BS, and heart size in five species of the neotropical whipsnakes genus Chironius that occupy terrestrial, semiarboreal, and arboreal habits and suggests that different restrictions, such as anatomical constraints, behavior, and phylogenetic inertia, may be important for the studied species.

On the structure of the aortic valves in snakes (Reptilia: Serpentes)

It is suggested that the presence of an interaortic foramen, with its associated valve, could result in an interAortic shunt of blood that potentially alters hemodynamics and flow patterns in the systemic circulation of snakes.

Neural Regulation of Arterial Blood Pressure in Snakes

The evolution of dense but variable adrenergic and peptidergic innervation of the heart and vasculature of snakes emphasizes the importance of autonomic reflexes in mediating regulation of hemodynamics.

Gravitational gradients and blood flow patterns in specialized arboreal (Ahaetulla nasuta) and terrestrial (Crotalus adamanteus) snakes

The markedly different responses of these two species suggest that morphological factors – such as differential gross cardiac displacement, or variation in the interaortic foramen – in addition to physiological factors, are important in determining a snake's ability to withstand hemodynamic stress.

Heart Position in Snakes: Response to “Phylogeny, Ecology, and Heart Position in Snakes”

Comment on a recent article that addresses previous adaptive interpretations of heart position in the context of gravity effects on blood circulation of snakes, which concluded that both habitat and phylogeny influence heart position, which they contend is relatively more posterior in arboreal compared to terrestrial species.



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.