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Representative isometric tension tracings of longitudinal muscle strips of a rat gastric fundus showing the control (A), the effect of 10 μM guanethidine (B) and of 3 μM nadolol in combination with 3 μM phentolamine (C) on the relaxations induced by electrical field stimulation (1–8 Hz, pulse width 1 msec, 9 V and duration 10 s) and nitric oxide (0.01–1 μM). This experiment was performed during a 0.1 μM 5-HT-induced contraction in the presence of 1 μM atropine.
