Evaporative Cooling in the Rat: Further Consideration of Functional Differences Between Salivary Glands

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Abstract
Previous reports indicated that submaxillary saliva, but not parotid saliva, was crucial to thermoregulation in the male rat exposed to inescapable heat stress, and emphasized the lower level of hyperthermia associated with the initiation of submaxillary secretion as one factor accounting for the difference between individual salivary glands. The present results indicated that submaxillary saliva was also crucial to the survival of female rats exposed to moderate heat stress, yet submaxillary and parotid secretions were increased at comparable levels of hyperthermia. Thus, it appears that the most important difference between the glands is not the level of hyperthermia associated with increased salivary secretion but the amount of fluid that is provided once secretion is begun.

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