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Fig. 9. Effect of 9-AC on stimulus evoked muscular contraction. (A,B) Muscular
contractions were consistently augmented when 1 mmol l1 9-AC
was applied to the bath. Washing with saline almost reversed this effect. The
9-AC effect was basically similar for single contractions (twitch) or tetanus
(5 Hz, 10 Hz) contractions, although it seemed to be less pronounced for
twitch contractions. However, no significant difference was detected between
twitch and tetanus. 9-AC did not change the time course (50% relaxation time)
of twitch contractions.