Gravity induced postponed potentiation as a result of repeated 2 G influence on rats.

On the base of electron- and light microscopical, immunocytochemical and morphometrical studies it was found that repeated 5-days' 2 G influence on the rats induced in the cells of the brain, pituitary and thyroid the alteration of structure, enzyme and hormone content which differed in quantity or quality from the changes arisen under the primary 5-days' 2 G and directed to increase in effectiveness of neuronal circuit, facilitation of synaptic transmission and elevation of hormone production. These structural and metabolic changes point out the animal capability for memorizing the change of gravity level and can be considered as an evidence of arise, hypergravity induced postponed potentiation that characterized the functional state of studied systems and presumably the functional state of whole organism which repeatedly was in the state of increased weightness.