Figure 4. Effect of naloxone on the size of the bladder C fibre reflex.
A–C, bladder C fibre reflexes obtained before (A) and at indicated times after systemic naloxone (0.025 mg kg−1i.v.; B and C). Time scale in C is for all records. D, time course of naloxone induced enhancement of the bladder C fibre reflex (○) and lack of effect on peripheral ganglionic discharge (dots). Reflex sizes are expressed as a percentage of the mean value before naloxone. Vertical bar marks the time of naloxone injection, arrows the sample records A–C.