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Effect of atropine (A, 1 μmol/L), atropine plus guanethidine (A+G, 1 μmol/L), atropine plus TTX (A+TTX, 1 μmol/L), and atropine (1 μmol/L) plus L-NNA (100 μmol/L) (A+L-NNA) on contractions caused by SP (100 nmol/L) in longitudinal (A) and circular (B) smooth muscle of rabbit duodenum, jejunum, and ileum. Columns indicate the mean values of integrated mechanical activity (% of SP), and vertical bars indicate SEM. eP<0.05, cP<0.01. Numbers in brackets indicate the number of segments.
