Figure 3. Variation in the ascending excitatory reflex evoked by distensions of different volumes.

Graphs show the amplitude of the first (^) and tallest (□) components of responses to balloon distension in A, the circular muscle (n = 6 preparations, n = 3 at lowest distension volume) and B, the longitudinal muscle (n = 5, n = 1 at lowest volume). Responses were expressed as a percentage of a standard response to a 0.5 ml distension (% STD). Error bars indicate s.e.m.