Graphic representation of the intravesical pressure that expresses urethral sphincter resistance values of a female rat after CYP admi- nistration, following the injection of L-NAME and L-ARG via i.t, with the addition of cumulative doses which increase and decrease the urethral sphincter resistance, respectively. Three recordings were performed during the experimental evaluation, 25-30 min after the administration of each drug dose. The top of the recording corres- ponds to the maximum intravesical pressure of the leak point of the fluid via urethra. Represents the beginning of fluid infusion into the bladder and the correspondent increase of the intravesical pressure.