A review of experimental and analytical work involving microwave heating of small animals. Empirical correlations are attempted on rectal temperature data for mice and dogs assuming the homeostatic mechanisms respond as nonlinear controls with constant coefficients and only capacity lag. Considerable improvement is found over correlations made on the basis of proportional controls. It is shown that, in principle, the homeostatic model can satisfactorily account for perturbations in the metabolic and evaporative terms; these are manifest in the step-function variation of the normal temperature. However, adaptive variation in the vasodilative heat dissipation mechanism causes the simple control models to break down.
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