[Heat-induced salivary gland hypertrophy: change during chronic heat exposure (34 degrees C). (author's transl)].
1 A slight rise in ambient temperature (34 degrees C) increased saliva secretion in the rat and this was accompanied by licking behavior, thus increasing heat loss by evaporation. 2 The rise in ambient temperature was accompanied by a hypertrophy of the submaxillary glands (Fig.1, 2), arising from activation of seromucous acini (Fig. 4, 5). 3 The hypertrophy reached a maximum after 2 to 4 days of heat exposure (Fig. 2); it was followed by a slow decrease. Normal values were obtained only after at least 3 weeks in the climatic chamber (Fig. 2, 3), which agreed with behavioral observations. Increased secretion of saliva may help to increase heat loss and maintain survival in a hot environment. 4 The absence of morphological changes in the sublingual g and and the evolution of the granular circonvoluted tubules (Fig. 6) contrast greatly with the hypertrophy of the submaxillary acinus. It is possible that heat-induced saliva secretion may be controlled by both sympathetic and parasympathetic systems.
D000818:Animals; D006358:Hot Temperature / Q000009:adverse effects*; D006984:Hypertrophy / Q000209:etiology; D008297:Male; D009696:Nucleic Acids / Q000378:metabolism; D009929:Organ Size; D010275:Parasympathetic Nervous System / Q000503:physiopathology; D051381:Rats; D012469:Salivary Glands / Q000294:innervation / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology / Q000648:ultrastructure; D013564:Sympathetic Nervous System / Q000503:physiopathology; D013997:Time Factors
D009696:Nucleic Acids
L'hypertrophie salivaire thermo-induite chez le rat. Evolution au cours de l'exposition chronique á la chaleur (34 degrees C).