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  • 1
    Electronic Resource
    Electronic Resource
    Thermal control of blood flow through capillaries and arteriovenous anastomoses in skin of sheep (1978)
    Springer
    Pflügers Archiv 378 (1978), S. 55-63 
    Details
    ISSN: 1432-2013
    Keywords: Skin blood flow ; Arteriovenous anastomoses ; Thermoregulation ; Heat stress ; Cold stress ; Microspheres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using radioactive microsphere and electromagnetic techniques, hindleg vascular responses were studied in 38 conscious, chronically prepared sheep subjected to either exposure to a warm environment, and/or local warming of the hypothalamus, spinal cord, forelegs or hindlegs. The total proportion of cardiac output passing through AVA's was increased by all treatments. AVA flow in hindleg skin was increased but capillary flow was unchanged by warming the hypothalamus, spinal cord or forelegs. AVA flow was unchanged but capillary flow was increased by warming the ambient air or the hindlegs alone. Equivalent cooling treatments resulted in AVA and capillary flow changes converse to warming. It is concluded that, in sheep, blood flow through cutaneous AVA's is controlled by specific thermoregulatory reflexes, whereas capillary flow is the target of local temperature effects. A significant role for the direction of the thermal gradient across the skin is implicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581958
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cardiovascular characteristics of two resting marsupials: An insight into the cardio-respiratory allometry of marsupials (1981)
    Springer
    Journal of comparative physiology 145 (1981), S. 95-100 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Minimum resting values for several cardiovascular and respiratory characteristics were established for two marsupial species,Trichosurus vulpecula andMacropus eugenii. Certain characteristics including heart rate, stroke volume and cardiac output varied significantly with body mass and allometric equations of the formy=aM b were derived to describe the relationships. The exponents of body mass,b, were generally similar to those for eutherian mammals, but in the marsupials they intercept,a, differed significantly from reported eutherian values. Although resting cardiac output in the marsupials appeared reduced in proportion to their lower resting oxygen consumption this pattern was not repeated for other variables. The stroke volume of the marsupials was 156% of eutherian levels while heart rate was less than 50% of the eutherian values. Initial data for respiratory variables also indicated comparable differences in this aspect of oxygen transport between marsupials and eutherians. Minimum respiratory rates of the marsupials were much lower than those of eutherians and tidal volumes appear larger in marsupials. The results are interpreted as suggesting that marsupials may have a large aerobic capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00782599
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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