Abstract
1. The variations in 5-HT and 5-HIAA levels following heat exposure and split heat does were determined in the different brain regions of Gerbillus pyramidum, Streptopelia senegalensis aegyptiaca and Agama stellio. 2. Heat exposure was found to be associated with an increase in the levels of the two indole compounds. 3. The 5-HT concentrations increased markedly in the three species following the first heat dose and decreased following the second dose in the various brain regions except in the cerebellum of Agama. 4. The increased 5-HT levels when animals are exposed to high temperature probably represent a response to activate heat-loss mechanisms and to depress heat production.
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