Abstract
An active reaction (change of pH) in hemolymph of the freshwater pulmonate mollusc Lymnaea stagnalis is studied in various physiological states: hunger, satiety, and alimentary excitation. In satiated animals the hemolymph pH is shifted to the acid area (7.6 ± 0.003) as compared with hungry animals (7.9 ± 0.05). The satiated individuals are characterized by an increased respiratory activity and decreased food consumption as compared with hungry animals. Acidification of the medium leads to an increase of excitability of the respiratory network interneurons (RPeD1, VD4, VD1/RPD2) and to inhibition of activity of the alimentary network interneurons (R/L CGC), whereas alkalization, to opposite effects. It is suggested that pH is one of factors coordinating activity of functional systems of Lymnaea stagnalis due to effect on neuronal correlates of the respiratory and alimentary behavior.
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