Some influences of the contractile element on the visco-elastic properties of bladder wall strips.

The influence of the inhibition and stimulation of the active element of pig bladder wall on the stress-decrease curves, determined on bladder wall strips, has been investigated. The properties of the strips were investigated by stepwise straining. Stress-decrease curves were analysed in terms of a multi-exponential model. The reduced activity of the active element was found to decrease the spread of the exponents (relaxation constants) of the bladder wall. The smallest of the three relaxation constants did not, however, appear to be influenced by the active element.