[Effect of sodium ion concentration on the structural and functional characteristics of bladder receptors]

The experiments were performed on the frog urinary bladder bushy receptors by means of a combined morpho-electrophysiological technique. Effects of decreased and increased (by 1.5 and 2 times) concentration of sodium chlorate in the alternating solution on morphological and electrophysiological characteristics of the vital receptors were investigated. Specific peculiarities of the complex morpho-physiological reaction were demonstrated at each effect studied. Analysing morphological phenomena, dynamic of spike activity and the literature data, a suggestion was made that for the receptors studied osmotic pressure fluctuations within hypotonic range serve as an adequate stimulator (besides the wall dilatation). Hypertonic medium produces a noticeable injuring effect of the receptor.