Figure 2.

EFS-induced NANC relaxations evoked by frequencies of 3 and 10 Hz in the guinea-pig isolated whole trachea were evaluated either as amplitude of the fast initial response (a) or as AUC (b) of the overall inhibitory response, including both the fast and the slow component. Note that the amplitude of the responses evoked by 10 Hz was significantly higher than that evoked by 3 Hz, whereas in terms of AUC the two responses were superimposable. Data represent mean and vertical lines show s.e.m. of 43 experiments. ^**P<0.01.