[Glycogen and glucose content in the tissues of the frog and reptiles]

In poikilotherm animals--the frog Rana ridibunda, lizards Lacerta strigata, Eremias arguta, snake Natrix tesselata--high glycogen and glucose concentrations have been found not only in the liver, but also in muscles and especially in the brain. The content of glycogen in the brain of the reptiles investigated is 63.5--4.2 times higher, whereas that of glucose--6.9--39.5 times higher than in the brain of rats. The level of free fatty acids in the blood of frogs and snakes studied is the same as in rats, being 3.8 times higher in the blood of the lizards.