[The morphometric characteristics of the serotonin-producing cells of the intestines in the red-cheeked suslik during its spontaneous arousal].

Duodenal serotonin-producing cells of the hibernating rodent (Citellus erythrogenys Brandt) were studied at its spontaneous arousal. Morphometric analysis of EC cells revealed alterations in endoplasmic reticulum and Golgi complex changes of numeral density and ratio of different types of ribosomes, retardation of granule content resorption at the spontaneous arousal of the animal. It is concluded that synthetic processes in EC-cells are rapidly activating, which probably restores the serotonin reserves, necessary for the normal course of hibernation.