[Morphofunctional findings on the reversibility of changes occurring during cold stress]

White rats exposed to low temperature (5-7 degrees C) over 80 days showed a slow growth of the body weight and liver, lowering of liver glycogen and cholesterol content, increase in the relative weight of the thyroid gland and in the nuclei size of adrenal medulla, fall of blood 11-HOCS level, change in the mitotic phase ratio in the epithelium of the tongue and cornea, and an increase in the number of pathological mitoses in the cornea. A great number of changes did not appear fully reversible after the discontinuation of the exposure to low temperatures.