EN
In the present paper, we have presented a theoretical discussion of specific biophysical mechanisms per taining to the regulation (by means of internal factors) of physiological water ex change with the water medium by the cells of the Nitella translucens. The investigation has demonstrated that these cells have a capacity for water ex change regulation through changes in the values of transport parameters of the cell membrane (i.e. the filtration coefficient Lp and the reflection coefficient σ), as well as changes in the concentration Csi (in side the cells) of the osmotically active solute.