. Comparative physiology of temperature regulation. Body temperature -- Regulation. JOHANSEN demonstrated the presence of well-developed mechanisms for compensatory heat production. However, this heat production and conservation are not governed by the same thermostatic arrange- ments that are present in rabbits. Grant me also a few words about insulation in the naked arma- dillo. The very large temperature gradients in the extremities and snout shortly after the beginningof cold exposure are likely of great significance (Figs. 15, 16, and 17). It is interesting to compare this observation wit
. Comparative physiology of temperature regulation. Body temperature -- Regulation. JOHANSEN demonstrated the presence of well-developed mechanisms for compensatory heat production. However, this heat production and conservation are not governed by the same thermostatic arrange- ments that are present in rabbits. Grant me also a few words about insulation in the naked arma- dillo. The very large temperature gradients in the extremities and snout shortly after the beginningof cold exposure are likely of great significance (Figs. 15, 16, and 17). It is interesting to compare this observation with those of Scholander and Krog on the sloths from 1957. These investigators suggest that the vascular bundles rete mirabile in the limbs of the sloths strongly facilitate the conserva- tion of central body heat at the expense of a profound cooling of the limbs. The principle involved is thought to be a counter-current heat exchange in the vascular bundles which provide a greatly enlarged contact surface between the counter-streaming arteries and veins (Scholander and Schevill, 1955; Scholander, 1958). In the sloth, subcutaneous temperature gradients in the legs were as. Figure 15. Cutaneous temperatures at various sites on the armadillo's body at air temperatures of 25 C - 30 C (upper numbers) and 5° C (lower numbers). (Johansen, 1961). 116. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hannon, John P; Arctic Aeromedical Laboratory (U. S. ); University of Alaska (College). Geophysical Institute; Viereck, Eleanor. Fort Wainwright, Alaska, Arctic Aeromedical Laboratory
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